Antigenic and genetic characteristics of influenza A(H5N1) and influenza A(H9N2) viruses and candidate vaccine viruses developed for potential use in human vaccines

February 2010

This summary provides a review on the influenza A(H5N1) and A(H9N2) virus activity and virus characterization, and describes the current status of the development of new A(H5N1) and A(H9N2) candidate vaccine viruses. It is meant to provide guidance for national authorities and vaccine companies on the selection of candidate viruses for use in vaccine development.

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