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

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

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Retroviridae
A viral load test detects the

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

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