Resistance to Tamiflu Increases

Resistance to Tamiflu Increases As seasonal influenza activity continues to increase, the CDC is monitoring a rise in resistance to Tamiflu (oseltamivir). But the increase in resistance is not worrisome enough that the agency is considering altering its recommendations about the use of antiviral medication. Of 350 influenza isolates tested this season, 16 (4.6%) were resistant to the antiviral medication, and all of the resistance is among H1NI influenza A virus, where it accounts for 8.1% of isolates tested -- up from 0.7% last flu season. The agency currently recommends Tamiflu or Relenza (zanamivir) as a second line of defense -- after vaccination -- against the seasonal flu, noting they can prevent infection or reduce the severity of disease. CDC surveillance shows that 84% of cases of flu are being caused by influenza A, with the remainder by influenza B. To read the CDC updated influenza activity report for this season to date, go to the CDC website.

< Prev		Next >