RT Journal
T1 Notice to readers: Revised estimates of the public health impact of 2009 pandemic influenza a (h1n1) vaccination
JF JAMA
JO JAMA
YR 2012
FD January 25
VO 307
IS 4
SP 358
OP 358
DO 
UL http://dx.doi.org/
AB 
In the May 20, 2011, report, “Ten Great Public Health Achievements—United States, 2001-2010,” on page 621, preliminary estimates of the impact of public health interventions during the 2009 H1N1 pandemic were presented as follows: “These public health interventions prevented an estimated 5-10 million cases, 30,000 hospitalizations, and 1,500 deaths.1” These estimates were derived using combined data from two sources: (1) an unpublished CDC model for estimating the impact of the 2009 H1N1 pandemic influenza vaccine on averting cases, hospitalizations, and deaths during the 2009-10 influenza season and (2) a model for estimating the impact of antiviral treatment in averting hospitalizations and deaths during the 2009-10 season.2 As a result of a programming error, the model used to estimate the impact of vaccination did not adequately adjust for the decreasing risk for disease as the pandemic progressed, and thus the impact of vaccination was overestimated.