In the last decade, leptospirosis has emerged as a globally important infectious disease. Humans most commonly become infected through occupational, recreational, or domestic contact with the urine of carrier animals, either directly or through contaminated water or soil. The disease occurs in urban areas of industrialized and developing countries as well as rural regions worldwide. We present a retrospective study conducted in 2006 on 2,269 randomly selected Reunion Island inhabitants. Blood sampling was performed on individual blotting papers, and microscopic agglutination test (MAT) was conducted on paper disc-absorbed (PDA) blood. We showed that seroprevalence of leptospirosis was 0.66% ± 0.34 in the global population of Reunion Island, which is 1.78 lower than the seroprevalence estimated 20 years before. The serological method is described, and the results discussion focuses on methodology and socio-economic factors.
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