Emerging infectious diseases
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Emerging Infect. Dis. · Feb 2012
Oseltamivir-resistant pandemic (H1N1) 2009 virus infections, United States, 2010-11.
During October 2010-July 2011, 1.0% of pandemic (H1N1) 2009 viruses in the United States were oseltamivir resistant, compared with 0.5% during the 2009-10 influenza season. Of resistant viruses from 2010-11 and 2009-10, 26% and 89%, respectively, were from persons exposed to oseltamivir before specimen collection. Findings suggest limited community transmission of oseltamivir-resistant virus.