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Morphological and molecular identification of Sarcocystis spp. from the sika deer (Cervus nippon), including two new species Sarcocystis frondea and Sarcocystis nipponi.
Parasitology Research 2018 May
Diaphragm muscles of 25 sika deer (Cervus nippon) farmed in Lithuania were examined for sarcocysts of Sarcocystis species. Two new Sarcocystis species, Sarcocystis frondea and Sarcocystis nipponi, were observed using light microscopy (LM) and transmission electron microscopy (TEM) and characterized by 18S ribosomal DNA (rDNA) and subunit I of cytochrome c oxidase (cox1) sequence analyses. By LM, sarcocysts of S. frondea and S. nipponi were ribbon-shaped and had finger-like sarcocyst wall protrusions, respectively. Under TEM, protrusions of S. frondea were about 9 × 1-1.5 μm, filled with clearly visible electron-dense substance and microtubules, type 39-like. Whereas, protrusions (about 9 × 0.2 μm) of S. nipponi arose from dome-shaped bases were filled with microtubules extending to the ground substance layer, type 9o-like. Moreover, three known Sarcocystis spp., Sarcocystis entzerothi, Sarcocystis ovalis, and Sarcocystis truncata previously described in other cervids as intermediate hosts, were characterized in sika deer. The cox1 was more suitable than 18S rDNA delimitating closely related Sarcocystis species from cervids. The phylogenetic results suggest that scavenger birds could be definitive hosts of S. frondea. According to the summarized morphological data on Sarcocystis found in the sika deer, such host should harbor at least nine different Sarcocystis species.
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