Question: a. Explain why a direct antigen test for HIV infection would be preferable to a serological test for antibodies. b. What factors have prevented the

a. Explain why a direct antigen test for HIV infection would be preferable to a serological test for antibodies.
b. What factors have prevented the development of an effective AIDS vaccine?
c. Give a plausible explanation for the fact that live, attenuated (or even dead) HIV vaccines pose a risk.

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