Recall that we discussed two different types of selection
in this chapter: selection of different virus strains within
one host and selection of those virus strains that are able
to transmit themselves from host to host. Now consider
the hypothesis, traditionally championed by biomedical
researchers, that disease-causing agents naturally evolve
into more benign forms as the immune systems of their
hosts evolve more efficient responses to them. Is the
evidence we have reviewed on the evolution of HIV
within and among hosts consistent with this hypothesis?
Why or why not?
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