Friday, January 18, 2013

Effectiveness of this season’s influenza vaccine

Virology Blog:
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 chain reaction.

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.


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