Discussion
Vaccination against hepatitis B also prevents hepatitis D because it
Answer: B
Correct answer: denies the delta agent the helper it needs
The delta agent is defective and cannot make its own envelope, so it borrows the hepatitis B surface antigen and can infect only someone who has hepatitis B. Prevent the B infection and there is nothing for delta to coinfect - so the vaccine protects against a virus it contains no part of.
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