January 18, 2013
The Centers for Disease Control and Prevention has released early estimates of the effectiveness of this season’s influenza vaccine in preventing influenza infection.
Influenza vaccine effectiveness is assessed each year by the U.S.
Influenza Vaccine Effectiveness Network. Patients with acute respiratory
infection (ARI) are enrolled in the study; respiratory samples are
taken and the presence of influenza virus is determined by polymerase
Data from 1,155 children and adults with ARI during December 3,
2012–January 2, 2013 were collected at five study sites and used to
determine that the estimated vaccine effectiveness is 62% (95%
confidence intervals = 51%–71%). This number represents the overall
effectiveness of seasonal influenza vaccine for preventing laboratory-confirmed influenza virus infection associated with acute respiratory infection.