Pandemic (H1N1) 2009 and seasonal influenza a (H1N1) co-infection, New Zealand, 2009

Abstract

Co-infection with seasonal infl uenza A (H1N1) and pandemic (H1N1) 2009 could result in reassortant viruses that may acquire new characteristics of transmission, virulence, and oseltamivir susceptibility. Results from oseltamivir-sensitivity testing on viral culture suggested the possibility of co-infections with oseltamivir-resistant (seasonal A [H1N1]) and -susceptible (pandemic [H1N1] 2009) viruses.