Delayed 2009 pandemic influenza A virus subtype H1N1 circulation in West Africa, May 2009-April 2010

Ndahwouh Talla Nzussouo, Jennifer Michalove, Ousmane M Diop, Richard Njouom, Maria de Lourdes Monteiro, Herve Kadjo Adje, Serge Manoncourt, Joseph Amankwa, Lamine Koivogui, Samba Sow, Mohamed Brahim Elkory, Jean-Marc Collard, Ibrahim Dalhatu, Mbayame Ndiaye Niang, Kathryn Lafond, Filomena Moniz, Daouda Coulibaly, Karl C Kronman, Buhari A Oyofo, William AmpofoBoubou Tamboura, Ahmed Ould Bara, Jean-François Jusot, Ekanem Ekanem, Fatoumata Diène Sarr, Inzune Hwang, Claire Cornelius, Babajide Coker, Stephen Lindstrom, Richard Davis, Erica Dueger, Ann Moen, Marc-Alain Widdowson

Research output: Contribution to journalArticle

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.

Original languageEnglish
JournalJournal of Infectious Diseases
Volume206 Suppl 1
Pages (from-to)S101-7
ISSN0022-1899
DOIs
Publication statusPublished - 15-Dec-2012

Keywords

  • Adult
  • Africa, Western/epidemiology
  • Child
  • Child, Preschool
  • Humans
  • Infant
  • Influenza A Virus, H1N1 Subtype/isolation & purification
  • Influenza, Human/epidemiology
  • Orthomyxoviridae
  • Pandemics
  • Time Factors

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