Term
Bacteria in dental disease |
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Definition
Oral cavity is a complex, dynamic ecosystem, containing 400 species of bacteria
· Dental caries – slow progressive infection of irregular areas of enamel surface
o Begins with colonization by slime-forming species of Streptococcus & cross adherence with Actinomyces
o Process forms layer of thick, adherent material (plaque) that harbors masses of bacteria which produce acid that dissolves enamel
o If plaque is allowed to stay, secondary invaders appear – Lactobacillus, Bacteroides, Fusobacterium, Porphyromonas, Treponema
o Acid dissolves tooth enamel
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Term
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Definition
Gram negative comma shaped bacteria.
Produces urease, which breaks down urea, producing ammonia that neutralizes stomach acid.
First observed in biopsied stomach tissue samples.
Responsible for 90% of peptic ulcers; cofactors in stomach cancer.
Dogs and Cats carry it. |
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Term
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Definition
Gram-Negative, microaeroplilic, spirally curved bacteria.
CJT- enterotoxin- bloody or watery diarrhea.
Culturing requires low O2 and high CO2.
Leading cause of food borne illness in US.
Poultry and beef contaminated. |
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Term
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Definition
Gram-negative facultatively anaerobic rods.
Resistant to dyes and bile.
Zoonotic- lives in GI tract of animals.
12-36 hours symptoms.
Invasion of lining of colon, inflammation.
Recovery in a few days
40,000-50,000 reported cases a year. |
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Term
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Definition
Gram-negative facultative anaerobic rods.
Strains that produce toxins cause 70% Traveler's Diarrhea.
Causes 50-80% UTI.
Indicator organism for human fecal contamination.
Infectious dose less than 10.
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Term
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Definition
Minor normal resident of intestine.
Antibiotics kill off normal flora, C. diff overgrows.
Antibiotic associated colitis- diarrhea, inflammed colon.
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Term
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Definition
Gram positive cocci.
Normally inhabits skin and mucous membranes.
Withstands high salt.
Produces enzymes and toxins.
Diseases: Abscesses, boils, pneumonia, bacteremia, toxic shock syndrome, food poisoning.
100 degrees C for 30 mins to inactivate. |
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Term
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Definition
common airborn bacteria.
Grows in cooked rice, potatoes, and meat.
Spores survive short cooking and reheating.
Spores germinate and produce toxins.
Eating toxins causes nausea, vomiting, cramps.
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Term
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Definition
Spores in soil, skin, vagina.
Causes gas gangrene in surgical incisions, etc.
Damaged or dead tissue supplies growth factors.
Fermentation of muscle carbs -> gas.
2nd most common cause of food poisoning world wide.
mild illness over in 24 hrs.
Toxin is heat labile. |
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Term
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Definition
Most common cause of severe, dehydrating diarrhea among children worldwide.
Causes 50% cases of diarrhea & death of over 600,000 children worldwide.
Usually mild in the US.
Causes hospitalization 55,000 kids/yr.
Been detected in many species of domestic animals, wild mammals, and birds.
Vaccine available in Jan 2006 |
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Term
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Definition
Named for outbreak in Norwalk, Ohio.
Causes 1/3 of all cases of viral gastroenteritis.
Lasts 24-48 hrs.
Virus survives on surfaces for hours.
Infected person can spread it for 3 days after symptoms. |
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Term
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Definition
Portal of entry: respiratory tract
Multiplies in respiratory tract and lymph nodes.
Self-limited, painful swelling of salivary glands.
Humans are the only reservoir.
40% of infections are subclinical.
300 cases in US/yr.
incubation 2-3 wk, muscle pain.
20-30% of infected males, testes become infected
live attenuated vaccine MMR |
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Term
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Definition
Hepatitis= inflammation of the liver
Transmission: Fecal-oral
Treatment: immune globulin
Vaccine: inactivated and attenuated vaccine available.
Chronic: No.
Prevention: Handwashing, vaccine, immune globulin |
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Term
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Definition
Transmission: blood, sex, perinatal
Treatment: interferon and reverse transcriptase inhibitors
Vaccine: recombinant vaccine produced by yeast
Chronic: Yes, 10%
Virus cannot be grown in tissue culture
Recombinant vaccine produced by yeast
Symptoms vary: 50% asymptomatic, early- loss of appetite, low fever, joint pains; later- jaundice; 10% become chronic carriers-> high risk for liver cancer |
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Term
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Definition
Transmission: mainly blood, not easily spread through sex, or to fetus
Treatment: interferon and ribavirin
Vaccine: none, rapidly changing virus
Chronic: yes, 80%
HCV cannot be cultured
HCV changes rapidly |
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Term
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Definition
Humans only known host.
Resistant to acid in stomach.
Survives in water and sewage for weeks.
Bad in areas with poor sanitation.
WHO targeting for eradication.
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Term
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Definition
Transmission: fecal-oral
Multiplication in pharynx & small intestine->lymph nodes->bloodstream.
only 10% infected people develop symptoms.
Death from respiratory failure. |
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Term
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Definition
1955- inactivated polio vaccine (IPV)
1963- oral polio vaccine (OPV) attenuated virus
Both are trivalent
Currently in US, only IPV used |
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Term
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Definition
Gram positive, endospore forming rods
Food poisoning- endospores are in soil, improper canning does not kill spores.
Die from respiratory or cardiac failure.
Botox
Infant Botulism: dont have well established normal flora, ingest endospores and germinate in the body producing toxins.
C. botulinum does not grow in adult intestines |
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Term
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Definition
gram positive endospore forming rods
common in soil and GI tract of animals
causes tetanus or lockjaw
endospores enter through puncture wounds, burns,etc
Vaccine: DPT- a toxoid, inactivated toin
Booster needed every 10 yrs |
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Term
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Definition
Gram positive non spore forming
Found in soil, water droplets on ceilings and floor drains.
grows in cold (fridge) temps
Killed during pasteurization and heating
deli meats are most susceptible
is a problem for pregnant women
may infect brain and meninges
stiff neck, meningitis
20% death rate
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Term
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Definition
Gram negative diplococi
Carried in nasopharynx, invades when resistance is lowered, enters bloodstream and meninges
Symptoms: high fever, chills, lethargy, rash.
in overwhelming infections: shock, coma, and death can follow within several hours.
9-12% die; of those who recover, 20% suffer serious after-effects
Vaccine does not contain live bacteria
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Term
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Definition
Transmission: involves mosquitoes feeding on birds infected with WNV
Blood, organ transplants, and breast feeding can spread it.
Symptoms: affect the central nervous system
80% will not show symptoms
20% have mild symptoms
1 in 150 develop serious illness
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Term
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Definition
= proteinaceous infectious particle
NOT a virus
misfolded proteins
resistant to heat, uv light, ionizing radiation
no antibodies, interferon, or inflammation in patient
protein only, no nucleic acid
encoded by a gene on chromosome 20
responsible for vacuoles and abnormal fibers forming in brain
insoluble is detergents; resistant to proteases
slow pathogenesis 1-30yr
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Term
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Definition
Scrapie in sheep and goats
Bovine spongiform encephalopathies (mad cow disease)
mink, deer, etc
Human- Creutzfeldt-Jakob Disease, Kuru
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Term
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Definition
If lesions are internal, people may not know they are infected.
Can lead to cervical/penile cancer.
5.5M new genital HPV infections each yr.
Several treatments, no cure.
Vaccine has passed clinical trials and may be available in July 2006. |
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Term
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Definition
Caused by Trichomonas vaginalis, a protozoa
Men rarely have any symptoms
Women usually have symptoms within 5 to 28 days of exposure: profuse and itching
5M new cases occur each year
Physician can easily diagnose, treat, and cure |
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Term
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Definition
4M
Very small Gram negative obligate intracellular bacteria
Human only reservior
Known as a "silent" disease; 75% women asymptomatic, 50% men asymptomatic
if symptoms occur, they appear 1 to 3 wks after exposure.
Causes eye infections and STD |
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Term
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Definition
May cause pelvic inflammatory disease and infertility
Women- bacteria initially infect the cervix and the urethra; might have an abnormal vaginal discharge or a burning sensation when urinating
Infections of the cervix can spread to the rectum
Men have burning and itching around the opening of the penis
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Term
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Definition
Gram negative diplococci
have capsules
attach by pili
humans are only reservior
grows in spaces b/t columnar epithellal cells, causes inflammation, pus formation
infection caused by single 1. men 20-30%, Women 60-90% |
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Term
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Definition
Men- a burning sensation when urinating, or a white, yellow, or green discharge from the penis. Sometimes men with gonorrhea get painful or swollen testicles. May appear 2 to 5 days infections or as long as 30 days to appear. |
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Term
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Definition
Women- symptoms often mild, but most have no symptoms. The initial symptoms and signs in women include a painful or burning sensation when urinating, increased vaginal discharge, or vaginal bleeding between periods. May lead to Pelvic Inflammatory Disease. |
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Term
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Definition
Rectal Infection- discharge, anal itching, soreness, bleeding, or painful bowel movements. Rectal infection also may cause no symptoms
Infections in the throat may cause a sore throat but usually causes no symptoms |
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Term
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Definition
Herpes virus family
lesions appear within 1 week
up to 500,000 people get genital herpes each year
Nationwide, 45 million people or 1 out of 5 of the total adolescent and adult population are infected with HSV-2.
Subclinical in 75% of patients
As many as 90% are unaware that they have the virus
Transmission may occur without visible lesions
Neonatal herpes can be very serious
No cure, treatments reduce recurrences |
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Term
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Definition
A spirochete bacteria
Fragile bacteria, cannot survive long outside of host
3 stages with long latent periods:
a. Primary- 9d-3months-chancre at site of infection
b. secondary-6 months later-fever, headache, sore throat, widely disseminated rash
c. tertiary-10-20 yrs or longer- lesions- gummas on skin & organs, neural & cardiovascular symptoms
Can cause serious heart abnormalities, mental disorders, blindness, other neurologic problems, and death. |
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Term
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Definition
An infected person who has not been treated may infect others during the first 2 stages, which usually last 1-2 yrs.
In its late stages, untreated is not contagious.
Passed from mother to child can result in neurological damage.
Currently- efforts are underway to eliminate
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Term
Which STD is the most common? |
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Definition
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Term
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Definition
1. Chlamydia
2. Gonorrhea
3. Syphilis
4. Trichomonas |
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