This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
A nurse has been found to be seropositive for both HbsAg and HBeAg. She is suffering from- 
Select and explain. 
A. Concurrent Hep B and Hep E infection, B. Acute infectious Hepatitis B, C. Chronic Hepatitis B infection, D. Past hepatitis B infection
B: Acute infectious Hepatitis B
Answer: B: Acute infectious Hepatitis B 
Explanation: HBsAg is an indicator of active infection in HBV infection. Hbs Ag appears in the blood late in the incubation period,but before the prodromal phase of acute type B hepatitis ;it may be present for a few days only,disappearing even before jaundice has developed ,but usually lasts for 3-4weeks & can persist for upto 5 months. HBeAg is an indicator of viral replication .In acute hepatitis B it may appear only transiently at the outset of the illness;its appearance is followed by the production of anti-HBe. Reference: Harrison20th edition pg 987