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Preliminary data indicate that the prevalence of influenza A (H1N1) virus strains resistant to the antiviral medication oseltamivir is high. Therefore, interim guidelines issued by the CDC are to use zanamivir or a combination of oseltamivir and rimantidine if influenza A (H1N1) infection is suspected.

Oseltamivir (Tamiflu) Resistance in Seasonal Influenza A (H1N1) Viruses

Preliminary data indicate that the prevalence of influenza A (H1N1) virus strains resistant to the antiviral medication oseltamivir is high. Therefore, interim guidelines issued by the CDC are to use zanamivir or a combination of oseltamivir and rimantidine if influenza A (H1N1) infection is suspected.