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Resistance to the neuraminidase inhibitor oseltamivir can be conferred by a well-characterized mutation in the neuraminidase gene, H275Y. In human H1N1 viruses that circulated in the first years of the 21st century, this mutation carried a fitness cost and resistant viruses were rare. During the 2007-08 influenza season, oseltamivir-resistant viruses of H1N1 phenotype emerged and predominated. March 2009 saw the emergence of a novel H1N1 influenza pandemic. We examined whether the H275Y mutation affected neuraminidase enzyme activity or replication of the pandemic influenza virus.

the journal of antimicrobial chemotherapy/journal of antimicrobial chemotherapy

Pandemic H1N1 2009 influenza virus with the H275Y oseltamivir resistance neuraminidase mutation shows a small compromise in enzyme activity and viral fitness