Leptospirosis is one of the most important zoonotic diseases based on the severity of the clinical course, frequency of fatal outcome and long-term clinical consequences. In Ukraine, leptospirosis is one of the most widespread natural-focal infectious diseases. Based on data of the Public Health Center of the Ministry of Health of Ukraine in 2017, the incidence rate was 0.77 per 100,000 population (330 cases), mortality rate was 0,08 per 100 000 population (case fatality rate was 10,9 %).