[HTML][HTML] Oseltamivir-resistant influenza virus A (H1N1), Europe, 2007–08 season
A Meijer, A Lackenby, O Hungnes, B Lina… - Emerging infectious …, 2009 - ncbi.nlm.nih.gov
Emerging infectious diseases, 2009•ncbi.nlm.nih.gov
Abstract In Europe, the 2007–08 winter season was dominated by influenza virus A (H1N1)
circulation through week 7, followed by influenza B virus from week 8 onward. Oseltamivir-
resistant influenza viruses A (H1N1)(ORVs) with H275Y mutation in the neuraminidase
emerged independently of drug use. By country, the proportion of ORVs ranged from 0% to
68%, with the highest proportion in Norway. The average weighted prevalence of ORVs
across Europe increased gradually over time, from near 0 in week 40 of 2007 to 56% in …
circulation through week 7, followed by influenza B virus from week 8 onward. Oseltamivir-
resistant influenza viruses A (H1N1)(ORVs) with H275Y mutation in the neuraminidase
emerged independently of drug use. By country, the proportion of ORVs ranged from 0% to
68%, with the highest proportion in Norway. The average weighted prevalence of ORVs
across Europe increased gradually over time, from near 0 in week 40 of 2007 to 56% in …
Abstract
In Europe, the 2007–08 winter season was dominated by influenza virus A (H1N1) circulation through week 7, followed by influenza B virus from week 8 onward. Oseltamivir-resistant influenza viruses A (H1N1)(ORVs) with H275Y mutation in the neuraminidase emerged independently of drug use. By country, the proportion of ORVs ranged from 0% to 68%, with the highest proportion in Norway. The average weighted prevalence of ORVs across Europe increased gradually over time, from near 0 in week 40 of 2007 to 56% in week 19 of 2008 (mean 20%). Neuraminidase genes of ORVs possessing the H275Y substitution formed a homogeneous subgroup closely related to, but distinguishable from, those of oseltamivir-sensitive influenza viruses A (H1N1). Minor variants of ORVs emerged independently, indicating multiclonal ORVs. Overall, the clinical effect of ORVs in Europe, measured by influenza-like illness or acute respiratory infection, was unremarkable and consistent with normal seasonal activity.
ncbi.nlm.nih.gov
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