Extension of occurrence area of the American fluke Fascioloides magna in south-western Poland.

Liver fluke Fascioloides magna is a typical parasite of American cervids. The reason for F. magna to appear in Poland territory was bringing the American wapiti deer to those forests around 1850. Along with these deer the aforementioned fluke was also introduced. The aim of this study was to present the case of finding of this species in cervids in Bory Zielonogórskie. Samples of deer feces were collected in February 2015 in Forest District Krzystkowice. A total of 16 samples of feces were examined, 7 of which came from the red deer, 4 from roe deer and 2 samples from fallow deer. Three grams of feces from each sample were examined for the presence of trematode eggs using the decantation method. Eggs of F. magna were detected in 2 of 7 examined samples from red deer, in the first sample it were found 3 eggs, and in the second one 46 eggs. Moreover, flukes eggs were found in 3 out of 4 roe deer faecal samples, in numbers of 1, 3 and 58 eggs respectively in each sample. Also, in faecal samples from two fallow deer were found in one of them 17 eggs F. magna. The results of this study extend the range of occurrence of the trematodes F. magna on the neighboring Lower Silesia Forest complex of Bory Zielonogórskie which are distant about 50 km. Fallow deer and roe deer were considered to be new in Poland definitive hosts of F. magna. .