Liver symposium Flashcards
(47 cards)
What is viral hepatitis caused by?
A, B= enteric viruses
C, D, E= parenteral viruses
What hepatitis viruses cause acute infections?
A, E
What hepatitis viruses cause chronic disease?
B, C, D
Where is Hep A prominent?
Developing countries and Greenland
How is Hep A transmitted?
Faecal oral
Sexual
Blood
What is the most common presentation of Hep A?
Asymptomatic
How is acute Hep A diagnosed?
By IgM antibody presence
Who is given immunisation against Hep A?
Travellers Patients with chronic liver disease Haemophiliacs Occupational exposure i.e. lab Men who have sex with men (MSM)
What is the typical timespan of Hep A?
Presentation 2 weeks after infection
Viremia gone by 6 weeks post infection
Clinical illness lasting 8 weeks post infection
What is the structure of the Hep B virus?
Inner protein core with antigen enclosing DNA
Outer lipid envelope containing surface antigen
What antigens are expressed from HBV?
HBeAg
HBcAg
HBsAg
What is the HBeAg and what does it do?
Antigen that is a sign of active replication
Iterferes with host immune system and prevents them from attacking the virus
What is HBsAg used to detect?
Presence of hep B virus, rather than activity
What is HBcAg used to detect and where is it found?
Active replication of HV
Only found in liver
What antibodies launch a response against HBV?
IgM
IgG
Anti HBe
Anti HBs
What is IgM presence used to detect in HBV?
If the virus has been acquired in the last 6 months
What does IgG indicate in HBV?
Chronic infection
What is the usual progression of HBV?
No progression from chronic virus
What can HBV progress onto?
Cirrhosis
Hepatocellular carcinoma
End stage liver disease
How does Hep C progress?
15% resolution
70% live with chronic
15% progress to cirrhosis, hepatocellular carcinoma and possible death
How is HCV treated?
Direct acting antiviral oral drugs
How is HCV diagnosed?
Test for the anti HCV antibody
WHt is Hep D?
Small RNA virus that can co infect with HBV
Why is HDV a confection with HBV?
HDV cannot support itself, it needs the HBV surface antigen