HBV is transmitted via:

Hepatitis B virus (HBV) is a highly resilient DNA virus that causes significant hepatic inflammation and chronic liver disease. It is a bloodborne pathogen that exists in high concentrations in nearly all body fluids of an infected individual. Transmission occurs when these fluids bypass the skin or mucosal barriers to enter the host. Understanding these transmission routes is vital for preventing the spread of the virus in healthcare and community settings. Rationale: A. Semen and vaginal secretions are significant vehicles for the transmission of HBV. Sexual contact remains one of the most common modes of viral spread globally. The virus can penetrate mucosal membranes during unprotected intercourse, allowing the viral particles to enter the bloodstream and infect the host's hepatocytes, making this a confirmed route of transmission. B. Mother's milk has been found to contain low concentrations of the Hepatitis B virus. While the risk of transmission through breastfeeding is considered low if the infant is properly immunized at birth, the virus is still detectable in the fluid. In an unvaccinated or non-immune population, any body fluid containing the virus poses a theoretical risk of infection. C. Blood is the most potent medium for HBV transmission, containing the highest concentration of viral titers. Exposure to infected blood through needle-stick injuries, shared syringes, or contaminated medical equipment provides a direct route for the virus to enter the systemic circulation. This is a major concern in clinical environments and among intravenous drug users. D. Transplacental transmission, also known as vertical transmission, occurs when the virus passes from the mother to the fetus during pregnancy or delivery. This often leads to chronic carrier status in the newborn if post-exposure prophylaxis is not administered immediately. The virus effectively crosses the biological barrier between the mother and child, establishing infection in the neonate. E. All of the above is the correct answer because HBV is exceptionally versatile in its ability to spread through various biological fluids and pathways. Whether through sexual fluids, breast milk, direct blood contact, or vertical transmission from mother to child, the virus utilizes multiple vectors to infect new hosts. Comprehensive infection control must address every one of these scientifically documented routes.