There is no vaccine against HIV. What is the possible reason?
Correct answer: A. The virus is highly mutated.
- A. The virus is highly mutated.
- B. The vaccine is too expensive.
- C. The virus can be controlled through change in hygiene.
- D. None of these options is correct.
Explanation
Efforts to develop an HIV vaccine have been hampered by the genetic diversity of the virus itself. The replication cycle of HIV is not only fast (a little more than 24 hours) but is prone to frequent errors, churning out mutated copies of itself which recombine into new strains as the virus is passed from person to person. Developing a single vaccine able to eradicate over 60 dominant strains as well as the multitude of recombinant strains-and on a global level-becomes all the more challenging when conventional vaccines can only protect against a limited number of viral strains.
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HIV is a retrovirus that infects CD4 T lymphocytes and gradually weakens immune function, while AIDS is the advanced syndrome caused by severe immune deficiency. Coverage includes viral transmission, replication, disease progression, opportunistic infections, diagnosis, prevention and the difference between HIV infection and AIDS.
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