Discussion
The following are true about hepatitis B:
Answer: C
Correct answer: Persistent presence of HBsAg increases the risk of chronic liver disease
Surface antigen persisting beyond six months defines chronic infection and carries the risk of cirrhosis and hepatocellular carcinoma. The other statements are all false: hepatitis B is a DNA virus, of the hepadnavirus family; the vaccine is a recombinant surface antigen subunit, not a live attenuated virus; and the incubation period averages 75 to 90 days rather than 30, which is nearer that of hepatitis A.
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