2. Methods
The outbreak investigation team did case finding in Fomboni
hospital and at Nioumachoua district health centre, interviewing
doctors and reviewing outpatient and inpatient registers. The au-
thors defined a suspected case as an inhabitant of Ndrondroni who
consulted between 19 December 2012 and 1 January 2013 with a
written diagnosis of food poisoning. To identify the affected area,
they reviewed the patients' home address and interviewed com-
munity health workers.