The first virological marker following acute infection with HBV is :
**Core Concept**
The first virological marker following acute infection with Hepatitis B Virus (HBV) is the presence of viral antigens in the blood. This is a critical concept in the diagnosis and management of HBV infection, as it indicates the early stages of the disease.
**Why the Correct Answer is Right**
The first virological marker following acute HBV infection is the presence of HBsAg (Hepatitis B surface antigen) in the serum. HBsAg is a protein on the surface of the HBV virus that is released into the bloodstream when the virus infects liver cells. The presence of HBsAg indicates that the virus is actively replicating and that the individual is infectious. This is followed by the appearance of anti-HBs (antibody to HBsAg), which is a sign of a developing immune response.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because HBV DNA is a viral nucleic acid marker, not a virological marker that appears first following acute infection.
* **Option B:** This option is incorrect because anti-HBs (antibody to HBsAg) appears later in the course of infection, after HBsAg has been detected.
* **Option C:** This option is incorrect because HBeAg (Hepatitis B e-antigen) is a marker of viral replication, but it appears later in the course of infection, after HBsAg has been detected.
**Clinical Pearl / High-Yield Fact**
It is essential to note that the presence of HBsAg in the serum indicates that the individual is infectious and requires prompt medical attention to prevent transmission to others.
**Correct Answer:** C. HBeAg is not correct, however the correct marker is HBsAg which is not listed in the options.