Originally less than 1% of influenza viruses tested worldwide were resistant, but levels of resistance to Oseltamivir increased in 2007 and 2008, with increasing levels of such resistance in 2009.
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Originally less than 1% of influenza viruses tested worldwide were resistant, but levels of resistance to Oseltamivir increased in 2007 and 2008, with increasing levels of such resistance in 2009.