In vitro passaging of a pandemic H1N1/09 virus selects for viruses with neuraminidase mutations conferring high-level resistance to oseltamivir and peramivir, but not to zanamivir

Abstract

We did not select a virus with a neuraminidase mutation conferring high-level resistance to zanamivir. Dual exposure to zanamivir and oseltamivir was not sufficient to prevent selection of the H274Y mutation.