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

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

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Retroviridae
HIV or Human Immunodeficiency Virus is considered unique because each virus contains:

sticky proteins that allow it to bind tightly to host cells
a viral enzyme known as reverse transcriptase
more than 100 copies of the viral genome
a genome made up of both DNA and RNA components

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Retroviridae
A viral load test detects the

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

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