An invasive species as an additional parasite reservoir: Trichinella in introduced American mink (Neovison vison).

The American mink (Neovison vison Schreber, 1777) is one of the most invasive alien mammal species which has been introduced to many countries in Europe, Asia and South America. As a predator which feeds on various prey, American mink carry many endoparasites; however, data about infection rate and prevalence of different parasites in mink are limited, especially concerning Trichinella spp. The aim of our study was to evaluate the role of American mink in the circulation of Trichinella species in its introduced range. In total, 812 muscle samples of mink from six feral populations and three farms in Poland were examined for presence of Trichinella muscle larvae using the artificial HCl-pepsin digestion method. Muscle larvae were found in 27 out of 812 individuals (3.3%) from six localities in western and north-eastern Poland. The intensity of infection varied from 0.1 to 274.8 LPG. The majority of Trichinella-positive individuals - 15 (55.6%) were infected with T. britovi, one with T. spiralis, and one with T. pseudospiralis. Two animals harboured T. britovi and T. spiralis in co-infection and this data confirmed the first report of a mixed Trichinella infection in American mink.