Question
A: Hepatitis B virus is preventable by vaccination. R: Hepatitis B can be transmitted parenterally.
Answer
- [x] a) Both A and R are true and R is the correct explanation of A
Assertion is true: Hepatitis B virus is indeed preventable by vaccination (a recombinant HBsAg subunit vaccine, part of the routine immunization schedule). Reason is true and correctly explains the assertion: HBV is transmitted parenterally (via blood/blood products, unsafe injections) as well as sexually and perinatally — the vaccine, which induces protective anti-HBs antibody, is specifically important because it prevents these efficient (particularly parenteral and perinatal) transmission routes; the ability to prevent infection via a well-defined, largely blood/body-fluid-mediated transmission route (as opposed to, e.g., a purely airborne pathogen) is directly relevant to why an effective, targeted vaccine strategy against HBV works, making the reason a correct explanation of the assertion.