Epidemiology Research Center (ML2), Marshfield Clinic Research Foundation, 1000 N. Oak Avenue, Marshfield, WI 54449, USA.
Abstract:
Adamantane-resistant influenza A is an emerging problem, but infections caused by resistant and susceptible viruses have not been compared. We identified adamantane resistance in 47% of 152 influenza A virus (H3N2) isolates collected during 2005. Resistant and susceptible viruses caused similar symptoms and illness duration. The prevalence of resistance was highest in children.