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Prevalance, Morphology, and Molecular Characterization of Sarcocystis heydorni Sarcocysts from Cattle ( Bos Taurus ) in China

Prevalance, Morphology, and Molecular Characterization of Sarcocystis heydorni Sarcocysts from... Cattle are intermediate hosts for 2 zoonotic species of Sarcocystis , Sarcocystis hominis and Sarcocystis heydorni . Here we report S. heydorni from cattle for the first time in China. Sarcocysts of S. heydorni were found in muscle from 173 of 1,630 (10.6%) cattle in abattoirs (9.7% in skeletal muscles, 3.4% esophagus, 2.5% diaphragm, and 0.1% tongue; heart muscle was negative). By means of light microscopy, S. heydorni sarcocysts were thin-walled (<1 μm). Using transmission electron microscopy, the sarcocyst wall had short (0.3–0.5 × 0.5–0.9 μm) stubby protrusions, the tips of which contained electron-dense, disk-shaped plaques, similar to the sarcocyst wall type 29b. In preliminary transmission attempts, a human volunteer did not excrete sporocysts in feces after ingesting 579 sarcocysts S. heydorni isolated from cattle. Phylogenetic analysis using the 2 molecular markers (18S rRNA gene and mitochondrial cox1 gene) indicated S. heydorni shared the closest affinity with species of Sarcocystis , which employ ruminants as intermediate hosts and canids as definitive hosts. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Parasitology Allen Press

Prevalance, Morphology, and Molecular Characterization of Sarcocystis heydorni Sarcocysts from Cattle ( Bos Taurus ) in China

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Publisher
Allen Press
Copyright
© American Society of Parasitologists 2016
Subject
SYSTEMATICS-PHYLOGENETICS
ISSN
0022-3395
eISSN
1937-2345
DOI
10.1645/16-49
pmid
27362658
Publisher site
See Article on Publisher Site

Abstract

Cattle are intermediate hosts for 2 zoonotic species of Sarcocystis , Sarcocystis hominis and Sarcocystis heydorni . Here we report S. heydorni from cattle for the first time in China. Sarcocysts of S. heydorni were found in muscle from 173 of 1,630 (10.6%) cattle in abattoirs (9.7% in skeletal muscles, 3.4% esophagus, 2.5% diaphragm, and 0.1% tongue; heart muscle was negative). By means of light microscopy, S. heydorni sarcocysts were thin-walled (<1 μm). Using transmission electron microscopy, the sarcocyst wall had short (0.3–0.5 × 0.5–0.9 μm) stubby protrusions, the tips of which contained electron-dense, disk-shaped plaques, similar to the sarcocyst wall type 29b. In preliminary transmission attempts, a human volunteer did not excrete sporocysts in feces after ingesting 579 sarcocysts S. heydorni isolated from cattle. Phylogenetic analysis using the 2 molecular markers (18S rRNA gene and mitochondrial cox1 gene) indicated S. heydorni shared the closest affinity with species of Sarcocystis , which employ ruminants as intermediate hosts and canids as definitive hosts.

Journal

Journal of ParasitologyAllen Press

Published: Oct 1, 2016

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