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The specific aim of this study was to provide epidemiologic information on leptospiral infection in healthy population in special service. These are considered to be the most important group in leptospirosis control not only due to the fact that they have frequent chance of exposure to the potentially dangerous environment for leptospiral infection but also the fact that an efficient preventive measure is urgently required for them. Seven hundred and fifty six service men and 197 their civilian neighbor were subjected for the study. The study included an epidemiologic analysis of the population through interview survey and this was further supported by bacteriologic and serologic confirmatory tests. Leptospira were isolated from the peripheral blood samples from those cases. The isolation positive rate were 0.5% of service men and 1.3% of the civilians. Percent of sereum antibody positives for microagglutination test (MAT) were varied from 8.3% of service men to 12.1% of the civilians. When the same population were subjected to the bacteridogical and serologic studies following the exposure to the time of harvesting, the percent of positives in both tests were increased 2.5 times comapared to those found in the same population before harvest season. Almost all of the bacteria positives (6/7) were found to be cases of inapparent infection. Only one out of the seven suffered from mild symptoms of leptospirosis complaining fever, conjuctival hemorrhage, headache, and nausea. More than half (53%) of the serum samples were reacted with L. icterohemorrhagiae serovar lai and 22% with L. irterohemorrhagiae serovar copenhageni. The rests (25%) were reacted with other groups, L. bataviae, L. canicola, L. grippothyposa, L. automnalis, and L. semaranga. none of the bacteria positives were antibody positives. The seroconversion rate following the expousre (harvest period) were 7.6% in service men and 9.3% in civilians, which were studies on month after the time.