title: Agro-ecological features of the introduction and spread of the highly pathogenic avian influenza (HPAI) H5N1 in northern Nigeria.
abstract: Nigeria was the first African country to report highly pathogenic avian influenza (HPAI) H5N1 virus outbreaks in February 2006 and has since been the most severely hit country in sub-Saharan Africa. A retrospective survey carried out towards the end of 2007, coupled with follow-up spatial analysis, support the notion that the H5N1 virus may have spread from rural areas of northern Nigeria near wetlands frequented by palaearctic migratory birds. Possibly, this could have happened already during November to December 2005, one or two months prior to the first officially reported outbreak in a commercial poultry farm (Kaduna state). It is plausible that backyard poultry played a more important role in the H5N1 propagation than thought previously. Farming landscapes with significant numbers of domestic ducks may have helped to bridge the geographical and ecological gap between the waterfowl in the wetlands and the densely populated poultry rich states in north-central Nigeria, where the virus had more sizeable, visible impact.
authors.affiliation: Food and Agriculture Organization of the United Nations (FAO), Animal Production and Health Division, Viale delle terme di Caracalla, 00153 Rome, Italy. giuliano.cecchi@fao.org
authors.forename: Giuliano
authors.initials: G
authors.lastname: Cecchi
authors.forename: Albert
authors.initials: A
authors.lastname: Ilemobade
authors.forename: Yvon
authors.initials: Y
authors.lastname: Le Brun
authors.forename: Lenny
authors.initials: L
authors.lastname: Hogerwerf
authors.forename: Jan
authors.initials: J
authors.lastname: Slingenbergh
mesh_terms: D000822:Animal Husbandry; D025041:Animal Migration; D000818:Animals; D000835:Animals, Wild / Q000821:virology; D001717:Birds / Q000821:virology; D002645:Chickens / Q000821:virology; D021821:Communicable Diseases, Emerging / Q000453:epidemiology* / Q000662:veterinary / Q000821:virology; D003710:Demography; D004196:Disease Outbreaks / Q000662:veterinary*; D004372:Ducks / Q000821:virology; D004463:Ecology; D053124:Influenza A Virus, H5N1 Subtype / Q000472:pathogenicity*; D005585:Influenza in Birds / Q000453:epidemiology*; D009549:Nigeria / Q000453:epidemiology; D011200:Poultry / Q000145:classification / Q000821:virology; D011201:Poultry Diseases / Q000453:epidemiology* / Q000821:virology; D040442:Public Health Informatics; D011891:Rain; D012189:Retrospective Studies; D012621:Seasons; D053833:Wetlands