Response to a Monovalent 2009 Influenza A (H1N1) Vaccine

Abstract

The rapid global spread of a novel 2009 influenza A (H1N1) virus (2009 H1N1) prompted the World Health Organization (WHO), on June 11, 2009, to declare the first influenza pandemic in 41 years.1 In the Southern Hemisphere, 2009 H1N1 infection has been dominant during the current influenza season.2 In the Northern Hemisphere, the incidence of 2009 H1N1 infection has increased substantially during the early part of the influenza season. The availability of safe and effective vaccines is a critical component of efforts to prevent 2009 H1N1 infection and mitigate the overall effect of the pandemic.3,4 Shortly after the identification . . .