**Question:** Which of the following suggests that a particular case of hepatitis B is highly infective?

A. Chronic Hepatitis B
B. Hepatitis B e-antigen (HBeAg) positive
C. High viral load
D. Liver cirrhosis

**Core Concept:** Hepatitis B infection is caused by the hepatitis B virus (HBV), which can lead to acute or chronic infection. Acute hepatitis B is usually less infectious compared to chronic hepatitis B. Hepatitis B e-antigen (HBeAg) is a viral protein produced during the acute phase of infection and is associated with high viral replication, making the infection more transmissible. High viral load indicates a higher number of hepatitis B surface antigen particles in the blood, correlating with increased infectivity. Liver cirrhosis is a consequence of chronic hepatitis B and does not directly relate to infectivity.

**Why the Correct Answer is Right:** The correct answer is B (Hepatitis B e-antigen [HBeAg] positive) because HBeAg is indicative of high viral replication and active viral shedding into the bloodstream. This increases the chances of transmitting the infection to another individual when there is close contact with the infected person's blood or body fluids.

**Why Each Wrong Option is Incorrect:**

A. Chronic Hepatitis B: Chronic infection is less infectious compared to acute hepatitis B due to reduced viral replication and shedding.
C. High viral load: While high viral load indicates a higher number of hepatitis B surface antigen particles, it is HBeAg positivity that is directly associated with increased infectivity.
D. Liver cirrhosis: Liver cirrhosis is a consequence of chronic hepatitis B and does not directly relate to infectivity, rather it indicates severe liver damage and poor prognosis.

**Clinical Pearl:** A high viral load and HBeAg positivity are crucial factors to consider when evaluating a patient's infectivity due to hepatitis B infection. Understanding these markers helps in providing appropriate counselling and infection control measures for contacts of such patients.