IMPORTANCE OF FLIES (DIPTERA BRACHYCERA) IN THE DISTRIBUTION OF HELMINTH EGGS FROM MUNICIPAL SEWAGE-TREATMENT PLANTS

Screenings were carried out in four mechanico-biological municipal was tewater treatment plants in two climatico-geographic regions of Slovak ia (submontane region: Levoca, Poprad and Tatranska Lomnica, lowland r egion: Michalovce). Ovoscopical studies traced the occurrence of helmi nth eggs in stabilized sludges in sludge beds. The flies (Diptera-Brac hycera) are considered as potencial biological vectors of helminth egg s. The stabilized sludges in sludge beds showed the presence of a wide range of helminth eggs Ascaris sp. 0-184 spec. Hymenolepis sp. 0-5 sp ec. Toxocara sp. 0-17 spec. Taenia sp. 0-2 spec. Trichuris sp. 0-17 sp ec. a Capillaria sp. 0-4 spec./100 g of sample dry matter. In the area s of four sewage treatment plants 461 fly specimens (358 females, 103 males) were captured, belonging to 31 species. On three specimens of P rotophormia terraenovae ectoparasites (mites) were detected. No eggs w ere found on the body surface of the flies.