Cattle (Bos taurus) are intermediate hosts for four species of Sarcocystis, namely Sarcocystis cruzi, Sarcocystis hirsuta, Sarcocystis hominis, and Sarcocystis rommeli. Of these four species, mature sarcocysts of S. cruzi are thin-walled (<1 μm), whereas S. hirsuta, S. hominis, and S. rommeli have thick walls (4 μm or more). Here, we describe a new species of Sarcocystis with thin-walled sarcocysts in cattle. Two newborn calves were fed with sporocysts from the feces of a human volunteer who had ingested raw beef. The calves were killed 111 and 222 days later. In addition to thick-walled sarcocysts of S. hominis, both calves were coinfected with a Sarcocystis species that had a thin-walled sarcocysts, distinct from S. cruzi. The sarcocysts were mature, microscopic, up to 80 μm wide, and up to 1060 μm long. By light microscopy, the sarcocyst wall was thin (<1 μm thick) and had minute protrusions. By transmission electron microscopy, the sarcocyst wall had short, conical villar protrusions (vp) that were up to 0.5 μm long and up to 0.5 μm wide, similar to type 29. The vp on the sarcocyst wall lacked microtubules but had six or more disc-shaped plaques. The ground substance layer was smooth, approximately 0.5 μm thick, and without microtubules. The bradyzoites were 8–11 μm long. The structure of the sarcocyst wall was distinct from any species of Sarcocystis reported from livestock. This unique species is named in honor of Dr. Alfred Otto Heydorn who provided the sporocysts.
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Dubey JP, Moré G, van Wilpe E, Calero-Bernal R, Verma SK, Schares G (2015a) Sarcocystis rommeli, n. sp. (Apicomplexa: Sarcocystidae) from cattle (Bos taurus) and its differentiation from Sarcocystis hominis. J Eukaryot Microbiol in press
Dubey JP, Calero-Bernal R, Rosenthal BM, Speer CA, Fayer R (2015b) Sarcocystosis of Animals and Humans. CRC Press, Boca Raton, Florida in press
Dubey JP, Hilali M, van Wilpe E, Calero-Bernal R, Verma SK, Abbas I (2015c) A review of sarcocystosis in camels and redescription of Sarcocystis cameli and Sarcocystis ippeni sarcocysts from the one-humped camel (Camelus dromedarius). Parasitology in press
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Dubey, J.P., van Wilpe, E., Calero-Bernal, R. et al. Sarcocystis heydorni, n. sp. (Apicomplexa: Sarcocystidae) with cattle (Bos taurus) and human (Homo sapiens) cycle. Parasitol Res 114, 4143–4147 (2015). https://doi.org/10.1007/s00436-015-4645-2
- Human volunteer