Shared Flashcard Set

Details

Micro Exam 2: Childhood Viral Illnesses
Microbiology!
43
Microbiology
Undergraduate 2
11/02/2012

Additional Microbiology Flashcards

 


 

Cards

Term
List the common childhood viral infections.
Definition
  • measles
  • Rubella (German measles)
  • Erythema infectiosum (Fifth disease)
  • Mumps
  • Varicella-Zoster (Chickenpox and shingles)
  • Coxsackievirus and Echovirus associated infections (hand-food-and-mouth disease)
Term

Measles: structure

             

 

Definition
  • paramyxovirus (related to mumps and RSV)
Term

Measles: occurance

             

Definition
  • world wide occurance, epidemics common in NA pre-vaccination but rare now
  • larger outbreaks in Canada in recent years
Term
Measles: vaccination institution? 
Definition
  • instituted in 1963
  • 2nd dose vaccine implemented in 1980s when we failed to eliminate completely
Term
Measles: transmission and replication?
Definition
  • airborne transmission
  • initial replication in respiratory tract and then disseminates (viremia)
Term
Measles: incubation and signs
Definition
  • 2 weeks to develop the rash
  • maculopapular rash evolves from face to trunk to extremities (including palms and soles)
  • Fever and the three Cs: cough, coryza and conjunctivitis
  • Koplik spots (sugary spots on mucosa next to molar teeth)
Term
What are the three C's of measles?
Definition
cough, coryza and conjunctivitis
Term
What are koplik spots and what infection are they from?
Definition
from measles; they are little sugary spots on mucosa next to molar teeth
Term
what are the complications of measles?
Definition
  • otitis media
  • pneumonia
  • encephalitis
  • death

third world thousands kids die yearly; common in kids and adults where malnutrition (especially vitamin A) is prevalent

Term
Is there a vaccine for measles? If so, describe it.
Definition
yes, a live virus vaccine administered with mumps and rubella (MMR) or with mumps, rubella, and varicella (MMRV)
Term
Diagnosis of measles?
Definition
IgM antibody levels
Term
Rubella virus type and method of transmission?
Definition

RNA virus - Togavirus

spread by respiratory droplets and vertically to fetus

Term
Rubella incubation period and signs?
Definition
  • rash develops after 2-3 weeks
  • infection may be sub-clinical esp in young kids
  • rash often mistaken for other rashes and drug rxns
  • adenopathy (swollen lymph nodes)
  • adults may get mild arthritis
Term
A rash for which disease is often mistaken for other rash illnesses and drug rxns? 
Definition
rubella
Term
what is the most severe complication of Rubella and when do most infections and complications occur?
Definition

congenital rubella

- most occur in first 16 wks of pregnancy (85% transmission rate to fetus)

Term
What are the defects of congenital rubella?
Definition
  • cardiac abnormalities
  • cataracts
  • deafness
  • brain, liver and organ damage
Term
diagnosis of Rubella?
Definition
IgM antibody detection
Term
What disease is also known as the "Fifth Disease"?
Definition
Erythema Infectiosum
Term
What is the cause of Erythema infectiosum?
Definition
Parvovirus B19 infection
Term
What is Erythema Infectiosum method of transmission? What population does it infect?
Definition
  • respiratory droplets and vertical (mom to fetus)
  • world wide, very common in early childhoot (50% infected by age 19)
Term
What are complications of Erythema infectiosum? 
Definition
  • "slapped cheek"
  • lacy pink rash of extremities
  • misscarriage or fetal abnormalities (severe anemia leading to heart failure of fetus)
Term
What is "slapped cheek"?
Definition
  • symptom of erythema infectiosum
  • distinct facial rash sparing the mouth area
Term
Diagnosis of Erythema Infectiosum
Definition
IgM antibody detection
Term
Is there a vaccine for Erythema Infectiosum?
Definition
NO!!!!
Term
Mumps: viral structure and method of transmission
Definition

paramyxovirus

droplets and fomites contaminated by saliva

Term
Mumps: occurance and incubation period?
Definition

occurs world wide, uncommon because of vaccine and especially after second dose MMR

- incubation 2-3 weeks

Term

Mumps: complications and symptoms

 

Definition
  • parotid gland swelling (95%)
  • other salivatory gland in 10%
  • occasionally: orchitis, meningitis in 15% --> deafness, encephalitis and pancreatitis are rare
Term
Mumps: diagnosis
Definition
best diagnosed by looking for viral RNA in saliva or urine (PCR)
Term
Varicella-zoster virus: structure and method of transmission?
Definition
  • member of herpesviridae (large icosahedral DNA double stranded)
  • airborne route primarily
Term
Is varicella-zoster very infectious?
Definition
YES, very, 90% of non-immune household contacts will become infected
Term
what is different about varicella-zoster compared to other herpes viruses?
Definition
almost all infections are SYMPTOMATIC
Term

What are the usual characteristics of chickenpox?

Where does virus replication and movement take place?

Definition
  • fever and generalized vesicular eruption
  • replicated in throught and spread through viremia to skin, reticuloendothelial tissue and rarely to lungs and brain
Term
chicken pox (varicella) incubation period and typical progression of rash?
Definition
  • incubation = 11-13 days
  • progression = macule, papule, vesicle, pustule, ulcer, crust
Term
if someone has something that looks like dew drops on rose pedal what is it? 
Definition
varicella-zoster (macule to pustule?)
Term
Complications of chickenpox?
Definition
  • pneumonia (15% adults w/ chickenpox)
  • disseminated infections of immuno-compromised
  • severe infections in newborns (mother not immune)
  • CNS involvement (rare: 1:200)
  • bacterial superinfection (S. aureus, S. pyogenes)
Term
Shingles: where does it become latent? what are the characteristics of it?
Definition
  • becomes latent in dorsal root and cranial nerve ganglia, reactivating later in life
  • inflammation of sensory nerve and their ganglia and a localized vesicular rash along the distribution of that nerve
Term
what is the principle comlication of shingles?
Definition
intense post-herpatic neuralgia 
Term
Diagnosis of varicella-zoster
Definition
  • clinical syndrome recognition
  • electron microscopy (all herpesviridae look alike)
  • virus culture
  • viral serology not necessary!
  • antibody measurement useful to determine immune status of exposed individual
Term
Is there a vaccine for varicella-zoster? If so, list.
Definition
  • YES!
  • Chicken pox vaccine 
  • shingles vaccine
  • VZ immune globulin (VZIG): post exposure prophylaxis (congenital or acquired immunodeficiency)
Term
Treatment of varicella-zoster
Definition
  • airborne precautions
  • ACYCLOVIR or cousine for immune-compromised or pneumonia/CNS infection
Term
Coxsackievirus and Echovirus: structure/family, time of infections and transmission
Definition
  • picornavirus
  • summer and fall
  • fecal-oral
Term
Coxsack and Echovirus: symptoms and other diseases caused by it
Definition
  • 50-80% asymptomatic
  • skin rash and can mimic other viral infections
  • common cause of meningitis, myocarditis
  • hand-foot-and-mouth disease
Term
What is hand-foot-and-mouth disease: population affected, cause, and symptoms
Definition

- mostly in kids

- usually Coxsackie A16

- sore throat, vesicles, fever, cutaneous lesions including hand and feet

Supporting users have an ad free experience!