SUMMARY
Leptospirosis outbreak was occurred in Klaten district, Central Java, in June 2005. This outbreak was caused dead case out of 4 cases (Case fatality rate 25%). The Lepto spirosis reservoir spot survey was conducted in Bakung village, Jogonalan sub district, Klaten district, Central Java, in July 2005. The aim of the study was to discover the prevalence of leptospirosis and the diversity of rats. The methods use was rats trapping and serology test, for leptospira. The result of the study found 3 kinds of rats species, i.e. Rattus tanezumi (in houses), Bandicota indica, R. tiomanicus (in rice field) and 1 species of shrew Suncus murinus. In addition to that, it was found that R. tanezumi (6.82% of 44 rats) was infected by Leptospira bataviae, L. autumnalis and L. icterohemorrhagiae.