L37_Hepatitis Viruses Flashcards Preview

Microbiology > L37_Hepatitis Viruses > Flashcards

Flashcards in L37_Hepatitis Viruses Deck (14):

In what sense are the hepatitis viruses related to each other?

They are NOT closely evolutionarily related but are grouped together simply because they all infect hepatocytes.


How are Hep A, B and C transmitted?

A is fecal-oral, B&C are sex/birth/blood transmitted


To which Hep to we have a vaccine for?

A and B


What diagnosis can be made by serology for HepA

IgM= Acute


What diagnosis can be made by serology for HepB

viral surface antigen=acute
IgG against viral surface antigen= recovered/vaccinated


What diagnosis can be made by serology for HepC

ELISA= real or false pos
RIBA (western blot)= confirmation


What are the more sever symptoms that can arise from Hep B and C, which has a lower rate of host success in fighting it off?

B and C can cause chronic hepatitis leading to cirrhosis and/or cancer. C is worse than B


What is done to treat B and C

treatment with polymerase inhibitors + IFN has polymerase inhibitors for treatment of serotype 1 of Hep C but they too have side effects


What types of measures are taken to increase success of liver transplant, what are some factors that could complicate the success of the transplant?

Liver transplant alleviates liver failure, but if virus was not cleared from secondary sites of infection, new liver becomes infected. Short course of antivirals preceding LDLT may be the answer.


What must you be aware of when having a patient undergo the grueling treatment courses for Hep B and C?

The types of alternative medicine they may be using and make sure they are only supplementing not replacing the real medicine.


Describe the virus structure of Hep A

picornavirus: ssRNA, naked, icosahedral capsid, single serotype


Describe the virus structure of Hep B

hepadnavirus: enveloped DNA virus, partly double stranded, replication produces decoys, single serotype


Describe the virus structure of Hep C

Flavavirus: enveloped, +RNA, 4 known serotypes


Can you get chronic infection with Hep A?