This study seeks to assess the epidemiological features of a GIS supported investigation of a cholera
outbreak in Abeokuta. Abeokuta, the capital city of Ogun State, Southwestern Nigeria with an area of
1256 km
2
and a population of 605, 451 people had an outbreak of cholera from 20
th November, 2005 to
1
st
of January, 2006. The outbreak affected the Abeokuta North Local Government area where the
municipal waterworks is located. Municipal water consumption was found to be associated with illness
[McNemar’s Chi square (X
2
= 20.5; p < 0.001) and Odds ratio 10]. The epidemiological surveillance data
showed a total of one hundred and fifteen cases and 11 deaths with case fatality rate of 9.6%. Male
specific and female specific case fatality rates were 11.9 and 7.1%, respectively. The age group of 15
years and above accounted for 68.3% of the cases and 90.9% of the deaths. Post epidemic
environmental investigation showed progressive contamination along distribution points. Cholera is
still a major cause of morbidity and mortality among youth and ageing population in Nigeria.