| Summary: | Small mammals are vectors of ectoparasites and reservoir of various pathogens of diseases. One of rodents and insectivores ectoparasites are fleas – vectors of bacteria, viruses, cestodes, nematodes and other disease agents. In our study small mammals were captured from 2011 years to 2012 years in Kuršių Nerija. A total were captured 318 rodents (including 186 Apodemus flavicollis, 5 Apodemus sylvaticus, 22 Myodes glareolus, 5 Microtus agrestis, 14 Microtus arvalis, 7 Microtus oeconomus, and 79 Micromys 30inutes) and 48 insectivores (Sorex 30inutes). One hundred eighty four fleas (including 4 genus: Hystrichopsylla, Ctenophthalmus, Palaeopsylla, Megabothris) were collected from 128 small mammals. Small mammals’ infestations with fleas in Kuršių Nerija were 35 % (128/366). The overall prevalence of infestation with fleas was 64% for M. arvalis, 60% for A. sylvaticus, 57% for M. oeconomus, 50% for M. glareolus, 38% for M. 30inutes, 34% for A. flavicollis and 0% for M. agrestis. Fleas’ infestations on rodents were 38 % (121/318) and on insectivores were 15 % (7/48).
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