Spatio-temporal epidemiology of highly pathogenic avian influenza (H5N1) outbreaks in Nigeria, 2006-2008

Pius S. Ekong, Els Ducheyne, Tim Carpenter, Olajide A. Owolodun, Agnes T. Oladokun, Lami H. Lombin, Dirk Berkvens

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

From 2006 to 2008, outbreaks of highly pathogenic avian influenza A (HPAI) virus of the H5N1 subtype occurred among poultry in Nigeria. We described the spatio-temporal patterns of the HPAI H5N1 outbreaks in Nigeria. Data of suspected and laboratory confirmed outbreaks maintained at the National Veterinary Research Institute Vom was analyzed using descriptive and exploratory analyses, GIS mapping, global and local spatial statistical analyses using the Cuzick-Edwards' (C-E) test and SaTScan Space-Time Scan Statistic. A total of 1654 suspected outbreaks were reported from 32 of the 36 States and the Federal Capital Territory (FCT), 299 were confirmed HPAI H5N1 positive from 27 states and FCT. The outbreaks occurred as three distinct epidemic waves with peak periods of January-March mainly in the North-West, North-Central and North-East regions during 2006 and 2007 and July-September in the South-West and South-South regions in 2007. Three spatio-temporal clusters were identified extending across States and international borders, consistent with disease transmission occurring through local and long-distance spread. This calls for enhanced strategies by the states and regional authorities to improve surveillance, prevention and control measures at the states, national and international levels.

Original languageEnglish (US)
Pages (from-to)170-177
Number of pages8
JournalPreventive Veterinary Medicine
Volume103
Issue number2-3
DOIs
StatePublished - Feb 1 2012

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Influenza in Birds
avian influenza
Nigeria
Disease Outbreaks
epidemiology
Epidemiology
disease transmission
Influenza A virus
space and time
control methods
poultry
statistics
Economics
monitoring
Spatial Analysis
Poultry
testing

Keywords

  • Epidemiology
  • H5N1
  • Highly pathogenic avian influenza
  • Nigeria
  • Outbreaks
  • Spatio-temporal pattern

ASJC Scopus subject areas

  • Food Animals
  • Animal Science and Zoology

Cite this

Spatio-temporal epidemiology of highly pathogenic avian influenza (H5N1) outbreaks in Nigeria, 2006-2008. / Ekong, Pius S.; Ducheyne, Els; Carpenter, Tim; Owolodun, Olajide A.; Oladokun, Agnes T.; Lombin, Lami H.; Berkvens, Dirk.

In: Preventive Veterinary Medicine, Vol. 103, No. 2-3, 01.02.2012, p. 170-177.

Research output: Contribution to journalArticle

Ekong, Pius S. ; Ducheyne, Els ; Carpenter, Tim ; Owolodun, Olajide A. ; Oladokun, Agnes T. ; Lombin, Lami H. ; Berkvens, Dirk. / Spatio-temporal epidemiology of highly pathogenic avian influenza (H5N1) outbreaks in Nigeria, 2006-2008. In: Preventive Veterinary Medicine. 2012 ; Vol. 103, No. 2-3. pp. 170-177.
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