Transmitted human immunodeficiency virus type 1 carrying the D67N or K219Q/E mutation evolves rapidly to zidovudine resistance in vitro and shows a high replicative fitness in the presence of zidovudine.

Abstract excerpt

Drug-naive patients infected with drug-resistant human immunodeficiency virus type 1 (HIV-1) who initiate antiretroviral therapy show a shorter time to virologic failure than patients infected with wild-type (WT) viruses. Resistance-related HIV genotypes not commonly seen in treated patients, which likely result from reversion or loss of primary resistance mutations, have also been recognized in drug-naive...

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