Seroprevalence of Leptospirosis among Army Personnel in Northeastern Malaysia

Abstract

Leptospirosis is a zoonotic disease caused by pathogenic Leptospira. The disease affects various high-risk groups including army personnel, who are at risk because of field activities that bring them into close contact with zoonotic reservoirs. This cross-sectional study determined the seroprevalence of lep-tospirosis among 616 asymptomatic army personnel in Northeastern Malay-sia. Sociodemographic data were obtained using validated questionnaires. Sero-logical screening for leptospirosis was performed using an ELISA method and confirmed by microscopic agglutination test (MAT). Samples indeterminate and positive according to ELISA (n = 117) were sent for MAT testing. A MAT titer ≥ 100 was considered positive evidence of exposure to leptospiro-sis. The overall seroprevalence of leptospirosis among the subjects was 16.2% (95% confidence interval: 13.32, 19.15). The most common reaction obtained with the sera tested by MAT was against a strain of Leptospira spp. isolated from Terengganu (38.3%) followed by L. biflexa serovar Patoc (35.2%). In conclusion, the seroprevalence of leptospirosis among army personnel in Northeastern Malaysia is high.