News & Perspective

Aug 08, 2011

Aug 08, 2011

Study puts global 2009 H1N1 infection rate at 11% to 21%

(CIDRAP News) – Researchers who combed through scores of serologic studies estimate that the global cumulative incidence of pandemic H1N1 influenza infection before vaccines became available was probably below 20%, far lower than the 50% that pandemic planners had envisioned as a possible worst case.