Global production of seasonal and pandemic (H1N1) influenza vaccines in 2009-2010 and comparison with previous estimates and global action plan targets.

Immunization against influenza is considered among the most important interventions in reducing the public health impact of seasonal epidemic and pandemic influenza infections. However, there are marked differences across countries with regards to production, supply and access to influenza vaccines. A global action plan (GAP) to increase supply of pandemic influenza vaccine was developed by the World Health Organization in May 2006 to reduce the anticipated gap between potential vaccine demand and supply during an influenza pandemic. To quantify the increase in global influenza vaccine production capacity and actual production in response to the influenza A(H1N1) 2009 pandemic, 3 years after the development of the GAP, the WHO conducted a survey of vaccine producers from December 2009 through February 2010, and compared the results of this survey with results from surveys conducted in 2006-2007 and May 2009.