The Role of Mustelids in the Transmission of Sarcocystis spp. Using Cattle as Intermediate Hosts.

There is a lack of research on the role of mustelids in the transmission of various Sarcocystis spp. In the present study we tested the hypothesis that widespread mustelids in Lithuania could be involved in the transmission of Sarcocystis spp. using cattle as intermediate hosts. In 2016-2020, intestinal samples of 84 mustelids were examined. Sarcocystis spp. were identified by species-specific PCR targeting the cox1 gene and subsequent sequencing. Under a light microscope, oocysts/sporocysts of Sarcocystis spp. were observed in 40 samples (47.6%), while using molecular methods, they were detected in 75 animals (89.3%). Four Sarcocystis spp. were identified in the intestinal samples of American mink (Neovisonvison), Beech marten (Martes foina), European pine marten (Martes martes), European badger (Meles meles) and European polecat (Mustela putorius). The prevalence of predominant Sarcocystis spp., S. bovifelis (89.3%) and S. cruzi (73.8%) was significantly higher than that of S. hirsuta (3.6%) and S. hominis (1.2%). In an individual sample, most frequently two Sarcocystis spp. were identified (69.0%), then a single species (15.5%) and three species (4.8%). The present study provides strong evidence that mustelids serve as definitive hosts for Sarcocystis spp. using cattle as intermediate hosts.