Declining trend in transmission of drug-resistant HIV-1 in Amsterdam

AIDS
Daniela BezemerNicole K T Back

Abstract

Symptomatic primary HIV infections are over-represented in the mainly hospital-based studies on transmission of resistant HIV-1. We examined a more general population for the prevalence of resistant HIV-1 strains among primary infections. From 1994 to 2002 primary infections were identified within the Amsterdam Cohort Studies (ACS) among homosexual men and drug users, and at the Academic Medical Center (AMC). Whereas primary HIV-1-infected AMC patients, often presented with symptoms of acute retroviral syndrome, ACS participants largely seroconverted during follow-up and thus brought also asymptomatic primary infections to our study. Reverse transcriptase (RT) and protease sequences were obtained by population-based nucleotide sequence analysis of the first HIV RNA-positive sample available. Subtypes were identified by phylogenetic analysis. Mutations were identified based on the IAS-USA resistance table. A total of 100 primary HIV-1 infections were identified (32 AMC and 68 ACS). Transmission of drug-resistant strains decreased over calendar time, with 20% [95% confidence interval (CI), 10-34%] of infections bearing drug-resistant mutations before 1998 versus only 6% (95% CI, 1-17%) after 1998. No multi-drug resistance pattern...Continue Reading

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