Fig. 2

Schematic representation of the surveillance data flow for estimating the sensitivity of a surveillance system, for the ith month and jth health facility. \({Attendees}_{i,j}\): patients attending the health facility, \({Fever}_{i,j}\): patients reporting fever, \({Suspected}_{i,j}\): patients being suspected for malaria, \({Tested}_{i,j}\): patients being tested for malaria, \({Confirmed}_{i,j}\): patients being confirmed with malaria, \({{P}_{SEEK}}_{j}\): probability of care seeking, \({{P}_{FEVER}}_{j}\): probability of having clinical symptoms (fever), \({{P}_{SUSPECT}}_{j}\): probability of being suspected for malaria, \({{P}_{TEST}}_{j}\): probability of being tested for malaria, \({{P}_{CONFIRM}}_{i,j}\): probability of being confirmed with malaria