1. Delayed 2009 pandemic influenza A virus subtype H1N1 circulation in West Africa, May 2009-April 2010.
- Author
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Nzussouo NT, Michalove J, Diop OM, Njouom R, Monteiro Mde L, Adje HK, Manoncourt S, Amankwa J, Koivogui L, Sow S, Elkory MB, Collard JM, Dalhatu I, Niang MN, Lafond K, Moniz F, Coulibaly D, Kronman KC, Oyofo BA, Ampofo W, Tamboura B, Bara AO, Jusot JF, Ekanem E, Sarr FD, Hwang I, Cornelius C, Coker B, Lindstrom S, Davis R, Dueger E, Moen A, and Widdowson MA
- Subjects
- Adult, Africa, Western epidemiology, Child, Child, Preschool, Humans, Infant, Orthomyxoviridae, Time Factors, Influenza A Virus, H1N1 Subtype isolation & purification, Influenza, Human epidemiology, Influenza, Human virology, Pandemics
- Abstract
To understand 2009 pandemic influenza A virus subtype H1N1 (A[H1N1]pdm09) circulation in West Africa, we collected influenza surveillance data from ministries of health and influenza laboratories in 10 countries, including Cameroon, from 4 May 2009 through 3 April 2010. A total of 10,203 respiratory specimens were tested, of which 25% were positive for influenza virus. Until the end of December 2009, only 14% of all detected strains were A(H1N1)pdm09, but the frequency increased to 89% from January through 3 April 2010. Five West African countries did not report their first A(H1N1)pdm09 case until 6 months after the emergence of the pandemic in North America, in April 2009. The time from first detection of A(H1N1)pdm09 in a country to the time of A(H1N1)pdm09 predominance varied from 0 to 37 weeks. Seven countries did not report A(H1N1)pdm09 predominance until 2010. Introduction and transmission of A(H1N1)pdm09 were delayed in this region.
- Published
- 2012
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