There is no vaccine against HIV. What is the possible reason for this?
Correct answer: A. Virus mutates rapidly
- A. Virus mutates rapidly
- B. Vaccine is very expensive
- C. Vaccines can be controlled by changes in hygiene.
- D. None of these
Explanation
The correct answer is "virus mutates rapidly." HIV is a retrovirus, which means that it reverse transcribes its RNA into DNA. This allows the virus to integrate its genetic material into the host cell's DNA, which makes it very difficult for the body's immune system to fight off.
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