S. tundra is an parasite of roe deer (Capreolus capreolus), reindeer (Rangifer tarandus) and moose (Alces alces). This parasite belong to genus Setaria, which includes more then 40 species, that are localised in the abdominal cavities of ruminants and equines. All these species produce microfilarias, which are present in host blood circulation. Our case report is the invasion of Setaria tundra in roe deer (Capreolus capreolus) in Lower Silesia. The 4 years old female of roe deer was found death, in forest in February 2010. There were found 12 females and 2 males in abdominal cavity. The histological examination of a tissue slabs from lung showed presence of microfilaria in the lumen of vessels as well as blood smears.

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