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. Distribution of the different HIV-1 subtypes. Viral cycle and drug targets. . . . . CRF01_AECRF02_AGCRF05_DFCRF06_cpxCRF10_CDCRF11_cpx. Virological and immunological responses among treated patients infected with HIV-1 B versus HIV-1 non B.. . Resistance to ARV agents is due to the selection of naturally occuring resistant variants, and arises when viral replication is not fully suppressed during drug therapy..
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