Naturligt forekommende mutationer i influenza A/ H1N1- virus med reduceret modtagelighed over for oseltamivir in vitro er set hos patienter, som baseret på den rapporterede information, ikke har været udsat for oseltamivir.
Naturally occurring mutations in influenza A/ H1N1 virus associated with reduced susceptibility to oseltamivir in vitro have been detected in patients who, based on the reported information, have not been exposed to oseltamivir.