Three-Class-Resistant Human Immunodeficiency Virus Type 1 Variant in a Drug-Naive Heterosexual Couple

Combination antiretroviral treatment was initiated in a heterosexual couple newly diagnosed with human immunodeficiency virus type 1 infection. Multiple genotypic drug resistance testing following early rebound of viral load revealed that the same three-class-resistant human immunodeficiency virus type 1 strain had been present in both patients since before initiation of treatment.