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Volume 21, Number 2—February 2015

Timing of Influenza A(H5N1) in Poultry and Humans and Seasonal Influenza Activity Worldwide, 2004–2013

Lizette O. Durand, Patrick Glew, Diane Gross, Matthew R. Kasper, Susan C. Trock, Inkyu K. Kim, Joseph S. Bresee, Ruben O. Donis, Timothy M. Uyeki, Marc-Alain Widdowson, and Eduardo Azziz-BaumgartnerComments to Author 
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (L.O. Durand, P. Glew, D. Gross, S. Trock, I.K. Kim, J.S. Bresee, R. Donis, T.M. Uyeki, M.-A. Widdowson, E. Azziz-Baumgartner); World Health Organization Regional Office for Europe, Copenhagen, Denmark (D. Gross); US Naval Medical Research Unit No. 6, Lima, Peru (M. Kasper)

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Summary data for 8 countries that reported 90% of worldwide influenza A(H5N1) outbreaks among poultry and 97% of all human H5N1 cases, January 2004–December 2013*

Country Geographic region No. poultry H5N1 outbreaks No. human H5N1 cases Peak month for poultry H5N1 outbreaks Peak month for human H5N1 cases Peak month for human seasonal influenza cases
China Northern Temperate 119 44 February January February
Egypt Northern Temperate 2,516 173 March March December
Turkey Northern Temperate 225 12 January January March
Bangladesh Northern Temperate/Tropical 549 7 February March July
Cambodia Tropical 35 47 February January October
Indonesia Tropical 3,555 195 February January December
Thailand Tropical 1,138 25 October January September
Vietnam Tropical 3,194 122 February January June

*H5N1 was declared endemic in Indonesia in 2005 and Egypt in 2007. After these dates, these countries did not report outbreaks to the World Organisation for Animal Health on a monthly basis. To obtain the monthly number of outbreaks after countries become endemic, we analyzed their 6-month reports; these reports are made by every country.

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Page created: January 20, 2015
Page updated: January 20, 2015
Page reviewed: January 20, 2015
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.