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Epidemiology of HIVQuestion 8/10

There are at least nine genetically distinct subtypes (clades) of HIV-1.

Which HIV subtype has been the predominant subtype in Europe and North America?

Figure 1. HIV Classification (Groups and Subtypes)
Source: Taylor BS, Sobieszczyk ME, McCutchan FE, Hammer SM. The challenge of HIV-1 subtype diversity. N Engl J Med. 2008;358:1590-602.
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Question Last Updated
May 3rd, 2026

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