Low rate of emergence of nevirapine and lamivudine resistance after post-partum interruption of a triple-drug regimen.

Low rate of emergence of nevirapine and lamivudine resistance after post-partum interruption of a triple-drug regimen. Research Abstract Details 

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Low rate of emergence of nevirapine and lamivudine resistance after post-partum interruption of a triple-drug regimen. Abstract Text:

INTRODUCTION: Emergence of nevirapine (NVP) resistance may be a consequence of its use in monotherapy to prevent HIV mother-to-child transmission (MTCT). The aim of this study was to evaluate the emergence of strains resistant to NVP and lamivudine (3TC) after discontinuation of antiretroviral therapy (ART) with 3TC/zidovudine (ZDV)/NVP. METHODS: Twenty pregnant women (ART-naive or preexposed only to ZDV), to whom 3TC/ZDV/NVP was prescribed as MTCT prophylaxis, were studied. They received ART for a median of 4 months with median viral load (VL) at labour <50 copies/ml. Samples were collected between 1 and 15 months (median: 3 months) after ART interruption. Sequence-selective real-time PCR (SPCR), which quantifies minority viral populations containing K103N, Y181C and M184V mutations, and standard genotypic sequencing were assayed. RESULTS: No mutations associated with resistance to 3TC or NVP were found by standard population sequencing. Analysis of K103N by SPCR showed that 35% of the patients contained < or =0.1% of viruses carrying either the AAC or AAT mutations. For Y181C mutation, 10% of the patients contained <0.5% of viruses with TGT codon change. For M184V mutation, one patient contained 6.2% of virus with GTG mutation and 13 patients (65%) contained <0.9% of mutated viruses. Four women were re-exposed to 3TC/ZDV/NVP and achieved HIV VL <50 copies/ml. No perinatal transmission occurred in any of the 22 births. CONCLUSIONS: NVP associated with ZDV/3TC as a regimen to prevent MTCT may involve a low risk for the selection of antiretroviral-resistant strains and may not jeopardize the use of these same drugs for future treatment.

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Low rate of emergence of nevirapine and lamivudine resistance after post-partum interruption of a triple-drug regimen. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Antiviral therapy

VOLUME: 13

Page Numbers: 135-9

Journal Abbreviation: Antivir. Ther. (Lond.)

ISSN: 1359-6535

DAY: 7

MONTH: 04

YEAR: 2008

Low rate of emergence of nevirapine and lamivudine resistance after post-partum interruption of a triple-drug regimen. Information

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LANGUAGE: eng

NlmUniqueID: 9815705

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Grant and Affiliation Information for Low rate of emergence of nevirapine and lamivudine resistance after post-partum interruption of a triple-drug regimen.

AFFILIATION: Fernandes Hospital, Infectious Diseases Unit, Buenos Aires, Argentina.

Country: England

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MEDLINETA: Antivir Ther

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