Expansion of Ashworthius sidemi in red deer and roe deer from the Lower Silesian Wilderness and its impact on infection with other gastrointestinal nematodes.

Nematodes Ashworthius sidemi are typical parasites of Asiatic cervids, mostly sika deer (Cervus nippon). Migrating red deer have probably introduced this parasite to the area of Poland from neighbouring countries. The aim of the study was to determine prevalence and intensity of infection of red deer and roe deer from the Lower Silesian Wilderness with A. sidemi after one year from previous studies and to examine the influence of these parasites on other species of gastrointestinal nematodes. 31 abomasa of red deer and 3 abomasa of roe deer from Forest Dictrict of Ruszów have been examined on the presence of parasites. In comparison with previous studies, red deer showed significant, over triple increase of prevalence of A. sidemi and over fivefold increase of mean intensity of infection. Maximum intensity of infection has increased over 24 times. These results indicate on dynamic spread of this new aswortiosis foci. Apart from previously registered parasite species, four new nematodes have been found in examined red deer and roe deer during this year studies. Red deer have been infected with Spiculopteragia assymmetrica, typical for fallow deer and Haemonchus placei - typical for bovine, whereas roe deer have been infected with Trichostrongylus axei and Trichostrongylus capricola, parasites of sheep, goats and bovine. Prevalence of red deer infection with nematodes S. boehmi and Ostertagia leptospicularis was lower than two years ago while prevalence of infection with S. mathevossiani and O. kolchida was higher. Intensity of infection with these nematodes has increased.