Abstract
The limited availability of approved influenza virus antivirals highlights the importance of studying the fitness and transmissibility of drug-resistant viruses. S247N is a novel, naturally occurring N1 neuraminidase mutation that reduces oseltamivir sensitivity and greatly potentiates oseltamivir resistance in the context of the H275Y mutation. Here we show that highly oseltamivir-resistant viruses containing both the S247N and H275Y mutations transmit efficiently in the guinea pig transmission model.
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