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Sensitivity, specificity and yield of the selected case definition, in all episodes (n=1732) (TH⩾80 & TH>A, Tx⩾4, Td=positive). Wi, Widal test; Tx, Tubex®; Td, Typhidot-M®. A greater than twofold increase in number of cases from 13 culture-confirmed cases to 28 cases by combined serologies.
