Because the novel influenza A (H1N1) virus [2009 influenza A (H1N1)] was identified in April 2009, two separate influenza vaccines were distributed in the United States in 2009–2010: a seasonal vaccine and an influenza A (H1N1) 2009 monovalent vaccine (2009 H1N1 vaccine).
Daily Archives: October 7, 2010
Influenza Activity – United States and Worldwide, June 13–September 25, 2010
Answers to common questions regarding influenza vaccine strain selection, including information on the virus strains recommended for use in the Northern and Southern Hemisphere influenza vaccines.