A patient can have antibodies against many strains of HIV.Which is the main reason that an effective vaccine has not been produced for the HIV virus that causes AIDS?
A) The virus reproduces very rapidly.
B) It takes two to three months to raise antibodies against the virus.
C) The virus is transmitted sexually.
D) The virus mutates rapidly, changing its outer coat.
E) The virus is not technically alive.
Correct Answer:
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