Global update on the susceptibilities of human influenza viruses to neuraminidase inhibitors and the cap-dependent endonuclease inhibitor baloxavir, 2017–2018

Publication date: Available online 28 January 2020Source: Antiviral ResearchAuthor(s): Emi Takashita, Rod S. Daniels, Seiichiro Fujisaki, Vicki Gregory, Larisa V. Gubareva, Weiijuan Huang, Aeron C. Hurt, Angie Lackenby, Ha T. Nguyen, Dmitriy Pereyaslov, Merryn Roe, Magdi Samaan, Kanta Subbarao, Herman Tse, Dayan Wang, Hui-Ling Yen, Wenqing Zhang, Adam MeijerAbstractThe global analysis of neuraminidase inhibitor (NAI) susceptibility of influenza viruses has been conducted since the 2012–13 period. In 2018 a novel cap-dependent endonuclease inhibitor, baloxavir, that targets polymerase acidic subunit (PA) was approved for the treatment of influenza virus infection in Japan and the United States. For this annual report, the susceptibilities of influenza viruses to NAIs and baloxavir were analyzed.A total of 15409 viruses, collected by World Health Organization (WHO) recognized National Influenza Centers and other laboratories between May 2017 and May 2018, were assessed for phenotypic NAI susceptibility by five WHO Collaborating Centers (CCs). The 50% inhibitory concentration (IC50) was determined for oseltamivir, zanamivir, peramivir and laninamivir. Reduced inhibition (RI) or highly reduced inhibition (HRI) by one or more NAIs was exhibited by 0.8% of viruses tested (n = 122). The frequency of viruses with RI or HRI has remained low since this global analysis began (2012–13: 0.6%; 2013–14: 1.9%; 2014–15: 0.5%; 2015–16: 0.8%; 2016–17: 0.2%). PA gene sequence dat...
Source: Antiviral Therapy - Category: Virology Source Type: research