eory, early treatment should offer the best chance of preserving immune function. but the new drugs do not completely eliminate hiv from the body so the medicines, which can have dangerous side effects, will have to be taken for a lifetime and perhaps changed to combat resistance. the new policy is expected to recommend that treatment be deferred until there are signs the immune system is weakening.
is a vaccine possible？
there is little question that an effective vaccine is crucial to controlling the epidemic . yet only one has reached the stage of full testing, and there is wide controversy over the degree of protection it will provide. hiv strains that are transmitted in various areas of the world differ genetically. it is not known whether a vaccine derived from one type of hiv will confer protection against other types.
in the absence of a vaccine, how can hiv be stopped？
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