Figure. Weekly cholera incidence in communal sections of Haiti in which water samples were positive for Vibrio cholerae O1; accumulated precipitation in the studied area by week during April 2012–March 2013; and number of environmental sites from which V. cholerae O1 was isolated, by month. Incidence was calculated from patients who were hospitalized in the Leogane cholera treatment center and who resided near the 4 sites found positive for V. cholerae O1 by Alam et al. (1): second communal section of Leogane for Lassale site; second communal section of Gressier for Gressier and Gressier Beach sites; and third communal section of Gressier for Jeffra site. Satellite-measured rainfall for 18.5°–18.6°N, 72.6°–72.5°W was extracted from http://disc2.nascom.nasa.gov/Giovanni/tovas/realtime.3B42RT_daily.2.shtml.