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.2015 Mar 13;10(3):e0119115.
doi: 10.1371/journal.pone.0119115. eCollection 2015.

Adamantane-resistant influenza a viruses in the world (1902-2013): frequency and distribution of M2 gene mutations

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Adamantane-resistant influenza a viruses in the world (1902-2013): frequency and distribution of M2 gene mutations

Guoying Dong et al. PLoS One..

Abstract

Adamantanes (amantadine and rimantadine) have been used to prevent and treat influenza A virus infections for many years; however, resistance to these drugs has been widely reported in the world. To investigate the frequency and distribution of M2 gene mutations in adamantane-resistant influenza variants circulated in the world between 1902 and 2013, 31251 available M2 protein sequences from different HA-subtype influenza A viruses (H1-H17) were analyzed and adamantane resistance-associated mutations were compared (L26F, V27A, A30T, A30V, S31N, G34E, and L38F). We find that 45.2% (n = 14132) of influenza A (H1-H17) viruses circulating globally were resistant to adamantanes, and the vast majority of resistant viruses (95%) bear S31N mutations. Whereas, only about 1% have V27A mutations and other mutations (L26F, A30T, G34E, and L38F) were extremely rare (their prevalence appeared to be < 0.2%). Our results confirm that H1, H3, H5, H7, H9, and H17 subtype influenza A viruses exhibit high-level resistance to adamantanes. In contrast, the appearance of adamantane-resistant mutants in H2, H4, H6, H10, and H11 subtypes was rare. However, no adamantane resistance viruses were identified among other HA subtypes (H8, H12-H16). Our findings indicate that the frequency and distribution of adamantane-resistant influenza variants varied among different HA subtypes, host species, years of isolation, and geographical areas. This comprehensive study raises concerns about the increasing prevalence of adamantane-resistant influenza A viruses and highlights the importance of monitoring the emergence and worldwide spread of adamantane-resistant variants.

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Conflict of interest statement

Competing Interests:The authors have declared that no competing interests exist.

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This work was supported by grants from the National High Technology Research and Development Program (863 Program) of China (2012AA12A407) and the National Key Basic Research and Development Program (973 Program) of China (2010CB530302). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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