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Public Health
info from public health lectures
335
Health Care
Professional
05/13/2011

Additional Health Care Flashcards

 


 

Cards

Term
How does the US public health care system differ from other parts of the health care system?
Definition
primary emphasis is PREVENTING disease and disability, and it focuses on POPULATION rather that individual health
Term
What is the common point or concept among defintions of public health?
Definition
prevention of disease and promotion of health
Term
What is Category A of public health?
Definition
tools and science of public health: epidemiology and statistics
Term
What is Category B of public health?
Definition
Health science research and investigation: biomedical sciences and environmental health sciences
Term
What is Category C of public health?
Definition
social and medical care sytem: social and behavioral science, and health care administration and medical care system
Term
What is the basic science of public health, and the study of anything that affects the population?
Definition
epidemiology
Term
Who often provides first indication of the nature of a new disease?
Definition
epidemiologists
Term
What is an epidemic?
Definition
a sudden and widespread outbreak of disease within a population, group or specific area
Term
What is an endemic?
Definition
the ongoing presence of a disease within a population, group or specific area
Term
What is the defining characteristic of a pandemic?
Definition
it occurs over a large geographic area, possibly worldwide
Term
What is incidence?
Definition
The number of new cases of disease or injury in a population per unit of time
Term
What is prevalence?
Definition
the total number of cases of disease or injury in a population at a given time
Term
Prevalence is affected by which main two factors?
Definition
Indidence and duration of disease in a population
Term
What is sensitivity?
Definition
proportion of diseased people who test positive
Term
What is specificity?
Definition
the proportion of well people who test negative
Term
Describe primary prevention
Definition
promotion of health at individual and community levels by promoting healthier behavior, preventing the onset of risk, eliminating exposure to environmental hazards - risk reduction, decrease indicidence
Term
Describe secondary prevention
Definition
strategies that seek to identify and control disease processes in early stages, reduces prevalence, - screening and treatment
Term
Describe tertiary prevention
Definition
strategies that prevent disability by restoring affected individuals to their optimal level of functioning after a disease or injury is established and damage is done - prevent recurrance and slow progression
Term
Dietary factors are asssociated with which 5 of the 10 leading causes of death?
Definition
coronary heart disease, cancer (colon), stroke, NIDDM, atherosclerosis
Term
What did Dr. Burkett have to say about health in US vs. Africa?
Definition
entire US constipated, african medical students go through 5 years training without seeing CAD or appendicitis, large stools = small hospitals
Term
What was the major killer of humans throughout history until the beginning of the 20th century?
Definition
infectious disease
Term
What sort of public health measures helped to conquer infectious diseases?
Definition
drinking water purification, proper sewage disposal, milk pasteurization, immunization, improved nutrition and personal hygiene
Term
In general, what are Koch's postulates?
Definition
a set of rules used to investigate the spread of infectious disease and prove that a specific organism caused a specific disease
Term
Who added the 4th rule for experimental proof of pathogenicity to Koch's 3 rules?
Definition
EF Smith
Term
Rule 1 of Koch's Postulates - the organism must be present in...
Definition
every active case of the disease
Term
Rule 2 of Koch's Postulates - the organism must be...
Definition
isolated and grown in laboratory culture
Term
Rule 3 of Koch's Postulates - When injected with laboratory culture...
Definition
susceptible test animals must develop the disease. If introduced to a different host it must produce the same infectious disease.
Term
Rule 4 of Koch's Postulates - The organism must be isolated from the newly infected animals and...
Definition
the repeated process must produce the same results.
Term
What are protozoa? They can cause different diseases in a community according to what factors?
Definition
a single celled animal that lives as a parasite in the human body, depends on the environment and health status of the individual
Term
What is cryptosporidium parvum? What is the disease it causes? What epidemic did it cause? Where can it live? How is it transmitted?
Definition
a protozoan, diarrheal disease cryptosporidiosis, caused Milwaukee diarrhea epidemic in '93, can live in intestine of humans/animals, passed in stool of infected person/animal
Term
What is Giardia intestinalis? Also known as what? Which illness does it cause? Where does it live? How is it passed? Can it survive outside the body?
Definition
a protozoan, giardia lamblia, causes giardiasis aka beaver fever, lives in intestine of people and animals, passed in stool, can survive outside for a long period because it is protected by an outer shell
Term
Giardia has become recognizes as one of the most common causes of which type of disease? Where are they found? In what sort of water?
Definition
waterborn, worldwide and in all regions of US, recreational and drinking water
Term
What type of organism are nematodes? What are their primary locations in the body? Name a few types.
Definition
parasites, intestines and tissue. Roundworms, whipworm, hookworms, pinworms.
Term
What organisms are the most common source of infection in the world?
Definition
nematodes
Term
What is direct vs. indirect transmission?
Definition
direct: from one person to another, indirect: via other means like water, air, food, vectors
Term
Bacteria and viruses cause what sort of respiratory infections? How are they transmitted?
Definition
colds, influenza, TB. transmitted thru air on aerosols, water droplets produce infection after infected person coughs or sneezes. Can also be transmitted thru touching objects and transferring to nose.
Term
How did early European settlers conduct germ warfare?
Definition
Gave smallpox patients' blankets to American Indians
Term
how are GI infections generally spread?
Definition
fecal-oral route
Term
Why do vector borne diseases generally cause a more complex route of transmission?
Definition
the disease has its own pattern of development after a person is infected
Term
The public health approach to controlling infection diseases is to...
Definition
interrupt the chain of infection
Term
What are the four links in the chain of infection?
Definition
1. pathogen, 2. reservoir, 3. method of transmission, 4. susceptible host
Term
Vaccination not only keep an individual from contracting a disease but also...
Definition
makes it harder for the pathogen to find susceptible hosts
Term
Describe the 3 steps of epidemiological surveillance
Definition
1. identify the cause, 2. break the chain of infection and halt the spread, 3. identify host, reservoir, vector and environment
Term
Rabies causes which fatal condition? How is it transmitted? What is the virus family?
Definition
viral encephalitis, through saliva of infected bats and some animals, rhabdoviridae
Term
Why is routine rabies vaccination not recommended?
Definition
expensive (may be up to $1500), inconvenient, several injections over a month
Term
The rabies virus infects only...
Definition
mammals
Term
What is the first line of defense in protecting people from rabies?
Definition
manditory immunzation of dogs because they are animals most likely to bite humans, cat vaccination is recommended as well
Term
What is the status of an animal capable of transmitting rabies in its saliva?
Definition
already has brain involvement, will exhibit symptoms, will die in a few days
Term
_____s are the most dangerous rabies threat to humans.
Definition
bats
Term
How was smallpox spread?
Definition
aerosol or touch
Term
Which disease is believed to have first emerged in Asia around the time of Christ, and spread in major epidemics claiming millions of lives during the Roman Empire, and in China, Japan, Europe and Americas?
Definition
smallpox
Term
What observation inspired the idea of vaccination?
Definition
survivors of the disease were immune to future infection
Term
What did Edward Jenner prove?
Definition
innoculation with cowpox provided immunity against smallpox
Term
By the year _____, routine immunization had eliminated smallpox in the US and other industrialized countries, but it was still widespread in underdeveloped countries
Definition
1958
Term
Which countries supported the WHO's program to eliminate smallpox? The last case was seen where and when?
Definition
US and Soviet Union, Somalia in '77
Term
Where is smallpox remaining today?
Definition
CDC in Atlanta, Russian lab in Siberia
Term
What organisms does poliovirus infect? Where has it been essentially eliminated?
Definition
only humans, western hemisphere
Term
Measles vaccine became available in what year? What two problems interferred with eradication?
Definition
1963, outbreaks occured among high school and college students who were vaccinated as babies, immunity conferred by vaccination in infancy wears off and booster is needed in older children
Term
A 1991 study in NYC found that up to ___% of cases of ____ were not reported.
Definition
50, measles
Term
What are zoonoses?
Definition
infectious diseases transmitted from animals to humans
Term
Most zoonosis are acquired when humans...
Definition
intrude into the animal's environment, or handle animals or their carcasses
Term
Transmission of zoonosis can occur my consumption of...
Definition
untreated/uncooked products like milk, cheese and preserved meat
Term
What causes brucellosis? Describe the pathogen.
Definition
infectious disease caused by bacterium of genus brucella, gram negative aerobic coccobacillus
Term
Name the 3 species of brucella (out of 6) that have public health implications.
Definition
brucella melitensis, suis, abortus
Term
Which species of brucella is the most pathogenic, invasive and frequently occurring? Which species follow it, in order?
Definition
melitensis, suis, abortus
Term
Describe the incubation period of brucellosis.
Definition
1-2 mo, intermittant or regular fever, sweats, malaise, headache. Any organ or system may be involved with variable presentation, but liver is always involved
Term
How long do blood cultures take for brucellosis? Why would you do a bone marrow culture? What is the most common lab method for diagnosis?
Definition
7-21 days, in patients with neg blood cultures, serology most common - IgM and IgG titers against 3 major pathogens, ELISA for sensitivity and specificity
Term
What type of cell does brucella survive within? What is the treatment of choice? What offers the best chance of recovery? What should you never use?
Definition
phagocytes (tx needs to penetrate cells), tetracycline + rifampin or doxycycline + gentamicin for 6 wks. Kids: trimethoprim-suldamethoxazole + rifampin. best change of recovery with doxycycline + aminoglycoside. never use single drug
Term
What is Plague caused by? Describe the pathogen. Where does it exist?
Definition
Yersinia pestis, aerobic gram-negative bacilli. Flea-born disease of rodents, exists in many rural and wooded areas througout the world
Term
Urban environmental transmission of plague can exist if what happens? What are most human cases acquired from? other cases from what?
Definition
if wild animals, humans and rats share the same environment. from inoculation by flea-bite transmission or handling infected rodents. other - inhalation of organism, or from infected pet
Term
In addition to rats, plague can be transmitted by...
Definition
chipmunks, ground squirrels, other wild rodents
Term
Describe the incubation period, onset of disease, and manifestations of plague?
Definition
1-7d, can be up to 12d, onset abrupt with fever, tremor and chills. toxemia and bacteremic as well as local disease. hemorrhagic manifesttion, buboes
Term
What are buboes? What are the most often involved areas? untreated cases result in what?
Definition
enlarged and suppurating regional LNs, surrounded by boggy, often hemorrhagic edema. inguinal nodes. pus discharge after a week or two.
Term
If large number of pts are presenting to ER with hemoptysis and severe rapidly progressive pneumonia, consider...
Definition
biologic attack with Y pestis
Term
Which organism can cause skin and mucous membrane petchial and ecchymotic lesions, intense hemorrhagic rash in bactermic case, pneumonitis less commonly but often rapidly fatal?
Definition
Y pestis
Term
Are pts with Y pestis pneumonitis infective? How might Dx be made?
Definition
highly infective, spreads by droplet. CXR, gram stain of LN aspirate or sputum
Term
What is a highly sensitive and specific test for Y pestis? How is definitive dx made? What are complications of this illness?
Definition
rapid ELISA antigen test, sputum and blood cx that are slow. Hemorrhagic necrosis resulting in parenchymal degeneration of most organs, body cavities may be filled with blood, death
Term
What is the prophylactic tx for plague?
Definition
doxycycline 100mg q12h for 7d
Term
What is the tx for plague? What type of antibiotics are highly effective?
Definition
streptomycin with or without tetracycline. broad-spectrum. quinolones, aminoglycosides, tetracycline and chloramphenicol are all effective. doxycycline or ciprofloxacin are also effective.
Term
What is tularemia? Describe the pathogen. What do you need to grow it? How is it transmitted to humans?
Definition
disease of rodents and birds caused by Francisella tularensis, gram negative coccobacilli. non-motile, aerobic, stains poorly. need special media with cysteine. transmitted to humans cutaneously or by innoculation from bite, scratch, or injuires acquired while handling or skinning carcasses
Term
Contact with what sorts of animals can cause tularemia? It is usually a sporadic disease, affecting which sorts of people? When/where is it more common?
Definition
Rabbits, muskrats, beaver, squirrels, deer, birds, ticks. Hunters, trappers, tourists to rural or forested areas. In temperate climates during summer months and hunting season.
Term
Presentation of tularemia is similar to what other disease? Describe the incubation period and onset.
Definition
plague. Incubation - 7-10d, up to 21d. Extremely rapid onset, fever, headache, malaise, myalgia, abd pain, diarrhea. acutaneous-lymphatic presentation (ulceroglandular), typhoidal presentation
Term
Which type of presentation of tularemia is common? Describe the presentation and the primary lesion.
Definition
acutaneous-lymphatic (ulceroglandular). nodular or sppurative lesion develops at innoculation site, with extension up the lymphatic channel, enlargement of draining LNs, which are often very tender and painful. Primary lesion appears as painful conjunctival ulcer.
Term
Describe the less common presentation of tularemia.
Definition
typhoidal presentation, feature of bacteremic disease, some cases develop widespread pneumonitis and respiratory failure, splenomegaly and transient rash are sometimes seen
Term
How long does it take for significant Ab titers to develop in pts with tularemia? The organism can be identified by culturing which sites?
Definition
2 weeks, skin lesion or sputum
Term
What is the DOC for tularemia? Is treatment always warrented? What are alternatives?
Definition
gentamicin, YES. Dox or streptomycin + tetracycline, chloramphenicol, TMP-SMZ
Term
What are two well-recognized examples of zoonotic streptococcal infections?
Definition
steptococcus suis of pigs, streptococcus zooepidemicus
Term
Streptococcus suis is gram-____, and an important pathogen of ___s. Epidemiology is similar to _______ in humans. It is carried in the _______, particularly in ______s. When subject to stresses of _____ or ____, the animal may develop clinical _____. Humans are infected through _____ ____ and tend to develop _______ with bacteremia.
Definition
positive, pigs, meningococcus, nasopharynx, piglets, crowding, transportation, meningitis, close contact, meningitis
Term
What type of strep is S. suis? What is the treatment? It is more common in animal herds with what conditions?
Definition
Beta-hemolytic, Lancefield R or S, benzylpenicillin with or without an aminoglycoside, course of 10-14d, poor ventilation and excessive crowding
Term
Streptococcus zooepidemicus causes ____ or ____-tissue infection, usually in people who have close contact with _____. Lancefield group? Treatment is?
Definition
bacteremic or soft-tissue, horses, C, benzylpenicillin plus aminoglycoside
Term
What causes toxoplasmosis? What type of organism is it? What is the definitive host?
Definition
toxoplasma gondii, protozoan, domestic cat
Term
What is the treatment for toxoplasmosis? What about in pregnancy?
Definition
pyrimethamine plus sulfadiazine. spiramycin.
Term
The tachyzoites of toxoplasmosis localize in what tissues?
Definition
neural and muscle
Term
What is lyme disease transmitted by? What does primary disease, secondary and tertiary result in?
Definition
small nymph tick. primary - erythema migrans. secondary - bell's palsy, meningitis, carditis. tertiary - monoarticular arthritis and encephalopathy
Term
How is diagnosis of primary lyme disease done vs. later forms?
Definition
clinical for primary, ELISA for later
Term
What is the most common insect-borne disease in the US? What is it caused by?
Definition
Lyme disease, Borrelia burgdorferi spirochete
Term
How is lyme disease transmitted?
Definition
by Ixodes nymph tick from deer to white-footed mouse to humans, must attach 36-48 hrs to transmit the spirochete
Term
Erythema migrans and a painless red-centered macular expansion lesion of 15cm which may cause itching are seen in...
Definition
primary lyme disease
Term
describe secondary lyme disease. what is Bannworth syndrome?
Definition
flu-like illess, generalized lymphadenopathy, migratory bone, joint, tendon and muscle pain. elevated CSF protein, CN V11's deficits with peripheral neuritis called Bannworth syndrome. CV involvement in a minority of cases
Term
Describe tertiary lyme disease
Definition
months to years after primary disease, musculoskeletal complaints, CNS - encephalopathy, mood/cognitive/sleep disorders, chronic skin infection containing spirochetes
Term
In diagnosing lyme disease, what lab tests would be used?
Definition
ELISA and western blot to confirm
Term
What is the treatment for primary lyme disease? What about disseminated disease with CN palsy?
Definition
amoxicillin or doxycycline x 10d. Doxycycline x 21d or IM ceftriaxone x 14d
Term
What is the actual leading cause of death in the US?
Definition
cigarette smoking
Term
What was the first export of the New World?
Definition
tobacco
Term
_________ is a cluster of cognitive, behavioral and physiological symptoms indicating an individual continues use of a substance despite significant substance-related problems
Definition
Dependence
Term
The need for greatly increased amounts of the substance to achieve intoxication (or the desired effect) or a markedly diminished effect with continued use of the same amount of the substance is called...
Definition
tolerance
Term
Maladaptive pattern of substance use manifested by recurrent and significant adverse consequences related to the repeated use of substance is called...
Definition
substance abuse
Term
In order to be considered substance abuse, the substance-related problem must have occurred...
Definition
repeatedly during the same 12-mo period or have been persistent
Term
What is the objective of Healthy People 2010?
Definition
decrease adult cigarette use in the US
Term
What are the quantitative goals of Healthy People 2010?
Definition
Decrease prevalence of adult use from 22.5% to <12%. Decrease prevalence of high school student use from 21.9% to <16%
Term
What is the most expensive addictive behavior in the US?
Definition
smoking tobacco
Term
Roughly how many deaths could be attributed to tobacco annually?
Definition
435,000
Term
How long after starting to smoke a cigarette do nicotine levels reach their peak? They gradually return to baseline within how long?
Definition
1.5-3 min, 2-3 hours
Term
What is the physiological explanation for the notion that smoking a cigarette has a positive effect on mood?
Definition
a continuous flux of blood nicotine levels, endless cycle of highs and lows
Term
As with cocaine, amphetamines, and morphine, addiction to nicotine is believed to result from ...
Definition
increased release of dopamine in the nucleus accumbens
Term
Where are the neurons that become more active with nicotine administration? This leads to an increase into which area?
Definition
the ventral tegmental area, the nucleus accumbens
Term
What false beliefs do many smokers have that create psychological dependence? Why are these false?
Definition
smoking increases concentration, treats stress and gives pleasure, smoking actually causes decline in physical and intellectual functioning
Term
Name some risk factors for developing a smoking habit
Definition
living with a smoker, single parent home or strained relationship with parent, comorbid psychiatric disorders, low self-esteem and self-worth, increased adolescent perception of parental approval of smoking, affiliation with smoking peers, availability of cigarettes, genetics
Term
What are risk factors for developing a smoking habit in BOYS particularly?
Definition
high levels of aggression and rebelliousness
Term
What are risk factors for developing a smoking habit in GIRLS particularly?
Definition
preoccupation with weight and body image
Term
Approx how much do current forms of NRT increase smoking cessation rates?
Definition
approx 1-2 fold
Term
Which enzyme is reduced by 30-40% in the brain of smokers?
Definition
MAO
Term
What proportion of lung cancer patients are current or past smokers?
Definition
over 80%
Term
In comparison to nonsmokers, smokers are __ times more likely to develop lung cancer if male and __ times more likely if female
Definition
23, 13
Term
Behavioral interventions for smoking cessation include...
Definition
physician advice and counseling, individual/group/telephone counseling
Term
Pharmacologic interventions for smoking cessation include...
Definition
NRT, sustained-release bupropion, clonidine, and nortriptyline
Term
Alternative interventions for smoking cessation include...
Definition
Hypnosis, acupuncture, exercise, lobeline, anxiolytics, mecamylamine, and opioid agonists
Term
What are the 5 A's in approaching smoking cessation?
Definition
Ask, Advise, Assess, Assist, Arrange
Term
What are the most cost-effective methods of behavioral intervention in smoking cessation? What is the main disadvantage of this approach?
Definition
Group sessions, few smokers are interested in attending specific classes at any given time
Term
About __% of patients who smoke say they would like to quit, but only 7.9% are able to do so without physician help
Definition
70, 7.9
Term
The advice of a physician alone can increase the smoking cessation rate to...
Definition
10.2%
Term
What are the first time pharmacologic interventions for smoking cessation?
Definition
NRT, bupropion
Term
What are the 5 forms of NRT available?
Definition
patch, lozenge, gum, inhaler, nasal spray
Term
What are the adverse reactions associated with NRT patches?
Definition
mild skin irritation, usually alleviated by rotating hte site. Sleep disruption, relieved by removing the patch at bedtime
Term
What does bupropion do? For whom would it be appropriate?
Definition
it's an atypical antidepressant with both dopaminergic and adrenergic actions. Slow release prep- Zyban. For smokers who don't want NRT, or tried NRT and failed.
Term
Nasal nicotine spray - each spray contains how much nicotine? How does quit rate for spray and inhaler compare to patch or gum?
Definition
0.5, some studies suggest it might have higher quit rate
Term
What is varenicline tartrate? How long is the course of treatment? For increased likelihood of long-term cessation, pts may continue for how long?
Definition
partial agonist for nicotinic Ach receps (Chantix). 12 weeks, 12 weeks.
Term
An astonishing __% of children in the US are regularly exposed to secondhand smoke
Definition
40%
Term
What is the leading cause of death among Americans aged 45-65? What is the second?
Definition
cancer, CV disease
Term
Cholesterol levels of ___ mg/dl or below are considered ideal: persons with that level of cholesterol have less than ___ the heart attack risk of those with levels between 250 and 275 mg/dl.
Definition
175, half
Term
What are the main sources of cholesterol in the American diet?
Definition
eggs, meat and milk
Term
American Cancer Society estimates that almost ____ of cancer deaths in the US are due to tobacco us
Definition
1/3
Term
The CDC estimates that what proportion of people with diabetes are aware they have it?
Definition
half
Term
What is the most common type of study in epidemiology? What does it involve?
Definition
Cohort study: The disease rate among those exposed to a particular factor is compared with the rate among the unexposed in the same cohort to determine if there is an association between the studied factor and the disease.
Term
_____________ is also known as follow-up, longitudinal, concurrent or classic types of Cohort studies.
Definition
prospective cohort study.
Term
What is involved with a Case-Control study? What is the most difficult problem with this type of study?
Definition
Two groups are compared: one group of people with the disease and the other without the disease. Problem is with selecting an appropriate control or comparison group
Term
In a cross-sectional study, subjects are selected regardless of what factors? This can also be referred to by which other names?
Definition
exposure or disease status, prevalence study or survey.
Term
What is a Type I error?
Definition
incorrect finding of association between exposure and disease
Term
What is Type II error?
Definition
incorrect finding of NO association (so there really is an association) between exposure and disease
Term
Most Type I and Type II errors occur because of...
Definition
small N value
Term
Bias = ______ error
Definition
systematic
Term
The P value =
Definition
the probability of obtaining the results by chance alone rather than by true association
Term
What does this describe? "The exposure has no effect on disease incidence rates and that differences in disease rates are due solely to natural variation."
Definition
the null hypothesis
Term
Formula: CI =
Definition
1-P
Term
A P value of 0.05 gives what CI? What does this mean?
Definition
0.95, 95% confidence that the finding is NOT due to chance alone
Term
The probability that a person with the disease was exposed is called...
Definition
Odds Ratio
Term
What is the formula for Odds Ratio?
Definition
a*d/b*c, or
(+exposure +disease) x (-exposure -disease) / (+exposure -disease) x (-exposure +disease)
Term
OR = 2. How much more likely is it that someone with the disease had the exposure?
Definition
2-fold greater chance
Term
What is risk ratio?
Definition
The probability that someone with the exposure will develop the disease compared to someone without the exposure
Term
What is the formula for risk ratio?
Definition
a/(a+b) / c/(c+d)
Term
What is the attributable risk?
Definition
The amount of risk that is added with exposure. (exposed risk of disease - nonexposed risk of disease)
Term
What is PPV?
Definition
The proportion of people who test positive who actually have the disease. i.e. percent of positives that are true positives.
Term
What is NPV?
Definition
The proportion of people who test negative who actually do not have the disease. i.e. percent of negatives that are true negatives.
Term
What is FPR?
Definition
the proportion of those who are disease free but test positive
Term
What is FNR?
Definition
the proportion of people who actually have the disease but test negative
Term
What does Bayes' Theorem say?
Definition
Bayes’ Theorem teaches us that pretest probabilities influence PV. Since we know there are FP and FN test results, Bayes’ Theorem helps us analyze these results and places them in clinical context
Term
What are the 3 steps of the role of the practitioner in the event of bioterrorism?
Definition
identify, report, refer
Term
Category A bioterrorism agents are ____ priority.
Definition
high
Term
What are some Category A agents?
Definition
anthrax, botulism, plague, smallpox, tularemia, viral hemorrhagic fevers
Term
Category B agents result in _____ morbidity rates and ____ mortality rates.
Definition
moderate, low
Term
What are some Category B agents?
Definition
Brucella, epsilon toxin of C. perfringens, food safety threats (salmonella, e. coli, shigella), glanders, melioidosis, psittocosis, Q fever, ricin toxin, staph enterotoxin B, typhus fever, viral encephalitis, alphaviruses, water safety threats (chorera, cryptosporidium)
Term
Which category of bioterrorism agents includes pathogens with the capability to be engineered for mass dissemination in the future?
Definition
Category C
Term
Category C agents are generally what sorts of diseases?
Definition
emerging infectious diseases like hantaviruses or Nipah virus
Term
What are the ideal qualities for an agent of biological terrorism?
Definition
high attack rate, high fatality rate, short time until death of victim, low level of immunity in the population, no effective treatment, transmitted person to person, easy to produce and disseminate, difficult to diagnose
Term
What are some priority biological agents (not viral)?
Definition
anthrax, plague, tularemia, brucellosis, Q fever, food and water borne pathogens
Term
What are some priority viral agents?
Definition
smallpox, viral hemorrhagic fevers, viral encephalitis
Term
What are some priority toxins (in bioterrorism)?
Definition
botulism, staph enterotoxin B, ricin, tricothecene mycotoxins
Term
What is an important factor in differentiating between a natural epidemic and a terrorist or warfare attack?
Definition
The developing disease pattern - gradual rise in incidence for natural epidemics, stark immediate rise in incidence for warfare attack
Term
HIV uses _____ as its genetic material
Definition
RNA
Term
What is the target of HIV?
Definition
CD4+ Tcells
Term
What was the first major step in fighting HIV?
Definition
development of a screening test in 1985
Term
What is the most common route of infection for HIV in the US?
Definition
IV drug users sharing needles
Term
What is the most common means of HIV transmission in Asia and Africa?
Definition
heterosexual relations
Term
What proportion of infants born to HIV+ mothers will be infected?
Definition
1/4
Term
Most emergent viruses are...
Definition
zoonotic
Term
The probability of transfer of viruses from endogenous animal hosts to man has increased due to...
Definition
human behavior
Term
What types of animals are most commonly involved in direct transfer of different infections?
Definition
rodents and arthropods
Term
What are important reservoirs for transfer by arthropods?
Definition
animals, especially primates
Term
Approximately ____ of the more than 520 known arthropod-borne viruses (____viruses) cause human disease. Approx __ might fulfill the criteria for emerging viruses.
Definition
100, arboviruses, 20
Term
The arbovirus infections are maintained in nature or through biological transmission between susceptible ______ hosts by _______ insects
Definition
vertebrate, blood-sucking
Term
What influences the names by which arboviruses are known?
Definition
places - West Nile, or clinical presentation - yellow fever
Term
How does the arbovirus get into the arthropod? Where does it penetrate into? What does it do next?
Definition
ingestion, tissue/gut wall/elsewhere, multiply
Term
What are some ecological factors in the emergence of infectious diseases?
Definition
population movements, deforestation, irrigation, long distance air travel, long distance livestock transportation, new routing of long distance bird migration
Term
What caused the fever, headache, hemorrhage and acute renal failure experienced by US troops during the Korean War?
Definition
hantavirus
Term
What animal is hantavirus associated with? It causes what disease in China? How is it transmitted to humans?
Definition
rodents, epidemic hemorrhagic fever, inhalation of aerosolized excreta
Term
A highly pathogenic hantavirus was found in what area of the US? What did it cause?
Definition
New Mexico, acute respiratory distress and death
Term
What is hantavirus infection characterized by? What animal was transmitting it in the US? Pts had exposure to what?
Definition
initial fever, abrupt onset of acute pulmonary edema and shock, deer mice, mouse droppings
Term
What is one of the reasons China is an especially fertile source of new flu strains?
Definition
animals reservoirs for the virus, like pigs and ducks, live in close proximity to humans
Term
What is SARS?
Definition
Severe acute respiratory syndrome (SARS) is a viral respiratory illness caused by a coronavirus
Term
What is the main method of transmission of SARS?
Definition
close person-to-person contact, respiratory droplets. Can also spread from touching an object contaminated with droplets and touching mouth, nose or eyes.
Term
______ virus, member of the FIloviridae family, emerged with outbreaks of severe hemorrhagic fever
Definition
Ebola
Term
Outbreaks of Ebola virus continue to appear periodically in which regions?
Definition
east, central and southern Africa
Term
Ebola virus has been associated with what type of animals that were imported to US from Philippines?
Definition
macaques
Term
Ebola has been associated with which animals in Africa?
Definition
bats
Term
Describe the central lesions of Ebola infection?
Definition
affect vascular endothelium and platelets, result in bleeding (esp from mucosa, abd, pericardium and vagina), capillary leakage leads to loss of intravascular volume, bleeding and shock
Term
What is the histopathologic change in Ebola infection?
Definition
focal necrosis of organs where the virus replicates, such as liver, lymphatic organs, kidneys, ovaries, testes
Term
Severe cases of ebola have acute respiratory disorders, and high fevers causing...
Definition
delirium, combative behavior
Term
Legionella bacteria were able to flourish in what environment? What regulation has been effective in limiting spread?
Definition
water towers for a/c, animicrobial agent use in the water
Term
What is the reservoir for lyme disease?
Definition
the white footed mouse, on which the deer tick feeds and becomes infected
Term
What strain of streptococci is more lethal and has been increasing in frequency? What did it cause in the early 20th century?
Definition
Group A strain, scarlet fever.
Term
The new strain of E Coli acquired a gene for what? Where did it come from?
Definition
shiga toxin, from a dysentery-causing bacteria, the gene jumped from one species to another while both present in human intestines
Term
E coli is commonly found in...
Definition
ground beef
Term
The jumping gene phenomenon has been found in what types of bacteria?
Definition
e coli, cholera and diphtheria bacteria
Term
Relative to medical applications, more antibiotics are used for...
Definition
animal food, to make livestock grow bigger and healthier
Term
One study has shown salmonella to be resistant to one more more abx in __% of cases
Definition
32
Term
Unfamiliar features of imported diseases include...
Definition
Presenting features
Diagnostic method
Management requirement
Unexpected complication
Unexpected infections
Term
Pandemic of influenza begins in _____ and spreads ______ across the world following the ______ season.
Definition
eastern Asia, westwards, winter
Term
Immunization against influenza provides __% protection in health recipients.
Definition
75
Term
What pathogen remains the prevalent epidemic organism in Europe and North America?
Definition
Group B meningococci
Term
Where do Group A meningococci epidemics occur?
Definition
Middle East, Africa, South America
Term
Local outbreaks of group A and C meningococci also occur in many countries, particularly...
Definition
West and Central Africa
Term
The meningococcus vaccine contains polysaccharide antigens of which groups?
Definition
A and C
Term
What is traveler's diarrhea, and what causes it?
Definition
at least 3 abnormally loose stools in any day, also vomiting, abd cramps and fever. More than 50% from enterotoxigenic E coli - ETEC
Term
When do symptoms of traveler's diarrhea begin most often? How long does the illness last?
Definition
on 3rd day after reaching destination, 4 days
Term
Elderly people traveling are advised to take 2-3d course of ______ at the first sign of diarrhea
Definition
ciprofloxacin
Term
What should you avoid eating in order to prevent traveler's diarrhea?
Definition
chopped fresh fruit, sandwiches with mixed fillings, raw or lightly cooked seafood, untreated water including ice cubes
Term
What causes typhoid and paratyphoid fever?
Definition
salmonella typhi and S. Paratyphi type A or B
Term
Typhoid and paratyphoid fever occur under what conditions?
Definition
when sanitation is poor or drinking water is insufficiently safe
Term
With modern treatment, morbidity of typhoid and paratyphoid fever is...
Definition
considerable
Term
Typhoidal fever is the typical ____ fever. The incubation period varies from ____ to ____, with an average of ____.
Definition
enteric, 6d, 4w, 2w
Term
What are the symptoms of typhoid fever?
Definition
fever, headache, abd discomfort, constipation, dry cough, confusion, delirium and psychosis
Term
After ____ - ____days, the fever of typhoid reaches its peak. What happens then?
Definition
7-10d, rose spots often appear on flanks, buttocks or costal margins and diarrhea begins.
Term
in untreated cases of typhoid fever, what can be expected during the second week?
Definition
complications - intestinal bleeding or perforation due to deeply ulcerated Peyer's patches, which can be large and require emergent surgery
Term
What are the main causes of fatalities from enteric fevers?
Definition
bleeding and perforation
Term
____ is an important feature of typhoid, with an incidence rate of 10-15%. It is more likely after ______, less likely after tx with _______.
Definition
relapse, inadequate treatment, ciprofloxacin
Term
The choice of abx for enteric fever lies between...
Definition
ciprofloxacin, high dose amoxicillin, trimoxazole and chloramphenicol
Term
In cases of enteric fever, resistance to the usual choice of abx may be found, and then _______ in standard doses may be effective.
Definition
ceftriaxone
Term
How is cholera spread?
Definition
drinking fecally contaminated water, ingesting shellfish may also be a vehicle
Term
In most countries, Cholera is due to infection with which biotype?
Definition
E1 Tor
Term
The new Cholera serotype O139 has appeared as a cause of epidemic illness in...
Definition
Bangladesh and India
Term
There was a small outbreak of Cholera infection in Texas and Louisiana due to unique strain of...
Definition
vibrio cholerae O1
Term
What is the usual incubation period of cholera? In classic cholera, there is an abrupt onset of what? What are the characteristics of this and what does it lead to?
Definition
3-4d, severe diarrhea, at first watery and brown, then pale fluid with little mucus and cell debris - rice water stool, continuous fluid loss leads to shock
Term
What type of treatment is successful in over 90% of cholera cases?
Definition
oral rehydration
Term
What are abx for cholera?
Definition
oxytetracycline orally or by NG tube, alternatively - ciprofloxacin or tetracycline
Term
Trypomastigotes and the Tsetse fly are associated with...
Definition
leishmaniasis
Term
Cercariae, Miracidia and snails are associated with...
Definition
schistosomiasis
Term
What are the four levels of disease study?
Definition
submolecular or molecular, tissue/organ, patient, community/population
Term
Which type of epidemiology is population-oriented/community-based, studies the origins of health problems (particularly those related to nutrition, environment, human behavior, social/psychological/spiritual state of a population), and seeks to discover risk factors in a population in order to prevent or delay disease or death?
Definition
classical epidemiology
Term
Which type of epidemiology involves the study of actual patients in health care settings to improve diagnosis, treatment and prognosis?
Definition
clinical epidemiology
Term
What type of epidemiology is concerned with the nature and pathogenesis of infection, the structure and classification of pathogens, and is heavily dependent on laboratory support?
Definition
infection disease epidemiology
Term
What type of epidemiology is mainly concerned with diseases like heart disease, cancer, diabetes, arthritis and Alzheimers, and uses complex sampling and statistical methods as investigational tools?
Definition
chronic disease epidemiology
Term
What is phamacoepidemiology?
Definition
the study of the use and the effect of drugs in large numbers of people
Term
What are the triad of factors in the causes of disease?
Definition
host, agent, environment, sometimes also vector
Term
Environment influences the contact between...
Definition
the host and the agent of disease
Term
Body temperature is regulated by which area of the brain, in combination with other neural structures? Which region is thought to be primarily responsible for maintaining core body temp?
Definition
anterior hypothalamus, region of hypothalamus near optic chiasm
Term
When core body temp drops below the set point, what happens?
Definition
the nervous system increases body metabolism and stimulates shivering and chills
Term
When core body temp exceeds set point, what happens?
Definition
the nervous system increases peripheral blood flow and sweating
Term
Normal body temp is...
Definition
37 degrees C
Term
Core temp is lower in the _____
Definition
morning
Term
Sweating, discomfort, flushing and skin that is warm to the touch often accompanies...
Definition
fever
Term
temp of 99-100.4 (37.2-38) is...
Definition
low fever
Term
temp of 100.5-104 (38-40) is...
Definition
moderate fever
Term
What is a high fever?
Definition
temp about 104 (40)
Term
Fever greater than 106 (41.1) causes...
Definition
unconsciousness, brain damage if sustained
Term
Fever is a consequence of the anterior hypothalamus responding to...
Definition
inflammatory mediators
Term
What are the mediators thought to stimulate a rise in the normal core temp set point? What releases them? In response to what?
Definition
IL-1, IL-6, TNF-a, IFN-y, from monocytes and macrophages, invasion by pathogens and other inflammatory stimuli
Term
Why might fever be detrimental in heart disease?
Definition
increased HR and O2 demands may lead to ischemia
Term
What response might a fever elicit in an elderly pt with limited mental capacity?
Definition
confusion and lethargy
Term
In association with high fever, children can suffer from...
Definition
seizures
Term
The pharmacologic agents used to reset thermal set point all have what action?
Definition
inhibit prostaglandin E2 production
Term
In children, ASA should be avoided because of increased risk of...
Definition
Reyes syndrome
Term
What are the requirements for FUO?
Definition
illness at least 3 weeks, fever of more than 38.3 on several occasions, no dx after routine work up for 3 days in hospital or after 3 or more outpt visits
Term
To exclude the possibility of factitious fever, you should use what type of thermometer?
Definition
electric
Term
What are the 3 major categories of causes of FUO?
Definition
infection, neoplasm, autoimmune disorder
Term
What are the 6 most common miscellaneous causes of FUO?
Definition
granulomatous disease, regional enteritis, FMF, drug fever, pulmonary emboli, factitious fever
Term
In pts under 65, what is the most common cause of FUO?
Definition
infection
Term
While investigating for infectious causes of FUO, which parts of the physical exam may be especially helpful?
Definition
skin, nail neds, fundi, cardiac ausculation
Term
Abdominal abscesses, miliary TB and disseminated fungal infections can be...
Definition
fatal
Term
In elderly patients, what is the most frequent cause of FUO?
Definition
neoplasm, esp lymphomas
Term
Which drug is probably responsible for most allergic drug reactions, including fever?
Definition
phenytoin (dilantin)
Term
In the absence of any clear cause for fever, a history of health care training should raise the clinician's suspicion of...
Definition
factitious fever
Term
Travel to which parts of the US are of special interest in epidemiology of FUO?
Definition
southwest US and Ohio River Valley
Term
Most infections that cause FUO require...
Definition
prolonged abx treatment and surgical drainage
Term
When a connective disorder appears to be the most likely explanation for FUO, empiric use of what drugs are often considered?
Definition
systemic glucocorticoids
Term
With FUO, which diseases should be carefully excluded because delay in diagnosis worsens the outcome?
Definition
intra-abdominal abscess, miliary TB, disseminated fungal infection and pulmonary emboli
Term
What disease can be caused by a bite or contact with fluids from a rat? Where does the pathogen live?
Definition
rate bite fever, upper respiratory system of rodents
Term
What two organisms may be transmitted from the bites of rats? What are their incubation periods? Which one causes rat bite fever?
Definition
streptobacillus moniliformis (7-10d, US), spirillum minus (1-4w, mostly Asia). moniliformis.
Term
The fever tends to be ______ when caused by S. Minus
The fever tends to be _______ when caused by S. Moniliformis
Definition
relapsing, swinging
Term
Both types of infection from rat bites may cause ____ with rash
Definition
FUO
Term
Which pathogen from rat bites does not grow well in artificial media?
Definition
S. minus
Term
Rickettsia rickettsii causes what disease? More common in which age range? What geographic locations?
Definition
Rocky Mountain Spotted Fever, 5-14, middle + southern Atlantic seaboard and central Mississippi River Valley
Term
What is RMSF most commonly transmitted by?
Definition
dog ticks, wood ticks, lone star ticks
Term
What is the incubation period of RMSF? Initial symptoms? What often occurs early in the disease?
Definition
2-14d, median of 7, fever, chills, headache, nausea, vomiting, cough and pneumonitis
Term
What disease does this describe:
Rash (not always found) begins as faint macule that progresses to large maculopapules and often petechiae
Rash begins in the wrist and ankles, characteristically involves palms and soles and then spreads to arm, legs, and trunk
About 3-5% of recognized cases in the United States are fatal
Definition
RMSF
Term
A history of tick bite, thrombocytopenia, hyponatremia, hepatitis, and low glucose in CSF is often seen in...
Definition
RMSF
Term
______ is a zoonosis caused by a strictly intracellular pathogen, Coxiella burnetii. It occurs worldwide, except in ________.
Definition
Q fever, New Zealand
Term
Which zoonotic bacteria affects mostly sheep, goats, cattle, dogs, cats, birds, rodents and is shed in urine, feces, birth products and milk?
Definition
Coxiella - Q fever
Term
What disease does this describe:
Incubation Period: 1-3 weeks
Febrile illness with headache, myalgias and nonproductive cough
Pneumonitis
Endocarditis
usually of aortic valve (in chronic cases)
Clinical course is variable from acute to chronic and relapsing
Definition
Q fever
Term
What is the main diagnostic test in Q fever?
Definition
A rise in the complement-fixing antibody titer is the main diagnostic
Term
What is Dengue fever? How is it transmitted? Where is it found?
Definition
very common togavirus infection, transmitted by bite of Aedes mosquito, Found throughout the tropics, also in southern Texas-Mexico border and Puerto Rico
Term
I am in the tropics. I have a benign acute febrile self-limiting illness, incubation was 7-10 d, my illness lasted 3-4d. What do I have?
Definition
Dengue fever
Term
In severe cases of Dengue, what bleeding disorder develops? In 20-30% of these cases, the pt develops what syndrome?
Definition
DHF, DSS
Term
What is Tick-Born relapsing fever caused by? What characterizes the fevers?
Definition
acute febrile illness caused by Borrelia spirochetes, high fevers spontaneously decline and recur
Term
Louse-born relapsing fever is caused by what? Is it more or less severe than tick-born?
Definition
Borrelia recurrentis, more severe
Term
Over __% of the world's population is at risk of malaria
Definition
40
Term
Malaria is not only the leading killer above all other diseases, but it is also a leading cause of...
Definition
poverty
Term
Humans (intermediate host) contract malaria after being bitten by the...
Definition
anophiline female mosquito
Term
What are the four plasmodium species that infect human? Which are more common causes of malaria?
Definition
plasmodium FALCIPARUM, malariae, ovale, VIVAX
Term
What are the two phases of the life cycle for malaria? Where do they occur? And what is the alternate name?
Definition
Sexual cycle: in mosquito, sporogony. Asexual cycle: in humans, schizogony
Term
Transmission of malaria starts when female mosquito (anopheles) feeds on a person with malaria and ingests blood containing ______.
Following 1-2 weeks gametocytes inside the mosquito reproduce sexually and produces infective _______.
Definition
Gametocytes, sporozoites
Term
In contracting malaria, sporozoites quickly travel via human blood stream to the ____ and invade _____s within 30 minutes
Definition
liver, hepatocytes
Term
Within the hepatocytes, most sporozoites mature to tissue ______ and some become ______. This form is called a _______, and takes __-__ months to activate into a tissue ______.
Definition
schizonts, dormant, hypnozoite, 6-11, schizont
Term
Relapses are seen in which forms of malaria because they produce a latent form in the liver?
Definition
P vivax and P ovale
Term
Each schizont that infected the hepatocytes produces 10,000 - 30,000 _____ that are released into the blood stream following cell lysis
Definition
merozoites
Term
Each merozoite can invade a single _____ and asexually replicate five times over 48 – 72 hours
Definition
red blood cell
Term
Once the merozoite enters the RBC, it matures into a ______. This form looks like a _____.
Definition
trophozoite, signet ring
Term
Most west Africans have complete resistance to P. ____ because their RBCs don’t have ___ receptor, which is required for invasion of RBC
Definition
vivax, Duffy
Term
Development of plasmodium in RBC is stopped/slowed in patients with...
Definition
G6PD, hemoglobin C and S as well as thalassemia
Term
What is the hallmark of all forms of malaria? What are the cold and hot stages of malaria?
Definition
Fever. Cold stage: occurs 15-60 minutes before the onset of fever. During this phase patient feels cold and shaking chills. Hot stage: body temp. rises to 41ºC. fever associated with loss of appetite and bone pain
After 2-6 hours fever falls and perfuse sweating occurs for 2-3 hours followed by extreme fatigue
Term
What is the most common, most dangerous and most severe form of malaria?
Definition
P falciparum
Term
What is the only species of malaria to cause fatal disease if untreated?
Definition
P falciparum
Term
Which forms of malaria have incubation periods of 1-14d, 12-17d, 16-20d, one month or longer?
Definition
falciparum, vivax, ovale, malariae
Term
What are most congenital cases of malaria caused by?
Definition
vivax and falciparum
Term
MOA for malaria chemotherapy is...
Definition
inhibit the heme polymerase required for plasmodium to produce malaria pigment. Inhibition of this function kills the organism
Term
________ derivatives bind iron in the malarial pigment to produce free radicals that damage parasite proteins
Definition
artemisinin
Term
_____ inhibits parasite mitochondrial transport
Definition
atovaquone
Term
Chloroquine-resistant malaria strains have...
Definition
energy-dependent chloroquine efflux mechanism that prevents the drug from concentrating in the parasite
Term
For prophylaxis of malaria, the safety of ______ during pregnancy has not been established but limited experience suggest that it may be used when the benefit are judged to outweigh the risk
Definition
mefloquine
Term
What is the formula for BMI?
Definition
height in meters / (weight in kg)^2
Term
An ideal BMI is said to be...
Definition
21
Term
Most studies show that weight-associated risks do not appear until BMI is over...
Definition
27
Term
People with BMI between __ and __ live longest
Definition
19, 22
Term
Who is more overweight, white or black women?
Definition
black women
Term
Obesity increases with age but declines past the age of...
Definition
75
Term
The prevalence of obesity in ____ does not vary much with income.
Definition
men
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