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Estimating effectiveness of case-area targeted response interventions against cholera in Haiti

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Michel, Edwige | Gaudart, Jean | Beaulieu, Samuel | Bulit, Gregory | Piarroux, Martine | Boncy, Jacques | Dely, Patrick | Piarroux, Renaud | Rebaudet, Stanislas

Edité par CCSD ; eLife Sciences Publication -

International audience. Case-area targeted interventions (CATIs) against cholera are conducted by rapid response teams, and may include various activities like water, sanitation, hygiene measures. However, their real-world effectiveness has never been established. We conducted a retrospective observational study in 2015-2017 in the Centre department of Haiti. Using cholera cases, stool cultures and CATI records, we identified 238 outbreaks that were responded to. After adjusting for potential confounders, we found that a prompt response could reduce the number of accumulated cases by 76% (95% confidence interval, 59 to 86) and the outbreak duration by 61% (41 to 75) when compared to a delayed response. An intense response could reduce the number of accumulated cases by 59% (11 to 81) and the outbreak duration by 73% (49 to 86) when compared to a weaker response. These results suggest that prompt and repeated CATIs were significantly effective at mitigating and shortening cholera outbreaks in Haiti.

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