2010 Jan – Summary of human infection with highly pathogenic avian influenza A (H5N1) virus reported to WHO, January 2003-March 2009: cluster-associated cases.

Wkly Epidemiol Rec. 2010 Jan 15;85(3):13-20.
WHO presents a summary of the global epidemiology of cluster-associated H5N1 infection cases up to the end of August 2009. During 2003-2009, 54 clusters of H5N1 infection were identified involving 138 cases (29% of 480 cases).