Retroviridae
The problem(s) associated with development of a vaccine against HIV is/are

all of these
rapid mutation of HIV
virus can spread from cell to cell by fusion to produce syncytia
antibody alone may be insufficient

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Retroviridae
A viral load test detects the

amount of bacteriophage being produced by E. coli cells
provirus of HIV in infected cells
total amount of virus in the infected host
number of viruses being released by each infected cell

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