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Oxford University Press (OUP), Clinical Infectious Diseases, 3(58), p. 319-327

DOI: 10.1093/cid/cit736

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Influenza Vaccine Effectiveness in the 2011–2012 Season: Protection Against Each Circulating Virus and the Effect of Prior Vaccination on Estimates

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Influenza vaccine effectiveness in preventing medically attended influenza in the 2011–2012 season was modest overall, with low effectiveness against the predominant A (H3N2) virus. This may be related to antigenic drift, but past history of vaccination might also play a role.