TABLE 1.

Case definitions and groupings of the patients included in the study

Group	Description	No. of cases
a	Clinically suspected laboratory-confirmed leptospirosisa	140
b	Clinically suspected laboratory-negative leptospirosisb	439
c	Seronegative healthy controls	138
d	Typhoid	107
e	Malaria	96
f	Hepatitis	110
g	Dengue fever	86

^aConfirmed cases of leptospirosis.

^bClinically suspected but serologically negative.