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Cholera outbreaks in rural communities are associated with high morbidity and mortality. Effective interventions to control these outbreaks require identification of source and risk factors for infection. In September, 2010 we investigated a cholera outbreak in Bashuri, a cholera naïve rural community in northern Nigeria to identify the risk factors and institute control measures.    Methods  We conducted an unmatched case-control study. We defined a case as any resident of Bashuri community two years and above with acute watery diarrhea with or without vomiting and a control as any resident two years and above without acute watery diarrhea and vomiting. We recruited 80 hospital-based cases and 80 neighborhood controls. We collected and analyzed data on demographic characteristics, clinical information and risk factors. Laboratory analysis was performed on 10 stool samples and 14 open-well samples.    Results  Mean age was 29 years (± 20 years) for cases and 32 years (± 16 years) for controls; 38 (47.5%) of cases and 60 (75%) of controls were males. Compared to controls, cases were less likely to have washed hands with soap before eating (age-adjusted odds ratio (AAOR) = 0.27, 95% confidence interval (CI): 0.10-0.72) and less likely to have washed hands with soap after using the toilet (AAOR = 0.34, 95% CI: 0.15-0.75). Vibrio cholerae O1 was isolated from six stool samples but not from any open-well samples.    Conclusion  Unhygienic hand washing practices was the key risk factor in this outbreak. We educated the community on personal hygiene focusing on the importance of hand washing with soap.

Cholera outbreak in a naïve rural community in Northern Nigeria: the importance of hand washing with soap, September 2010