During the 2007-08 flu season, a small increase in the overall number of flu viruses resistant to the 

neuraminidase inhibitor oseltamivir was observed. Among specimens collected since October 1, 2007, 

no resistance to oseltamivir was identified among the 444 influenza A (H3N2) or the 305 influenza B viruses 

tested. However, 111 (10.9%) of the 1,020 influenza A (H1N1) viruses tested were found to be resistant to 

oseltamivir, an increase from four (0.7%) of 588 influenza A (H1N1) viruses 

tested during the 2006-07 season. No resistance to zanamivir has been detected.