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

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

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Retroviridae
A viral load test detects the

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

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