Detection of Sarcocystis Parasites in Retail Beef: A Regional Survey Combining Histological and Genetic Detection Methods

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Sarcocystis spp. are parasitic protists acquired when undercooked, cyst-laden meat is consumed. While both Sarcocystis hominis and S. cruzi encyst in beef, only S. hominis is pathogenic to humans. In this study, we used histological methods and novel molecular techniques to determine the regional prevalence and identity of Sarcocystis spp. in retail beef. Of 110 samples, 60 supported amplification of parasite rRNA by PCR. All 41 sequenced representatives were identified as S. cruzi. To compare detection methods, 48 samples were then examined in parallel by histology and PCR, and 16 and 26 samples, respectively, were positive. Five samples positive by initial histologic sections were not amplified by PCR. Fifteen PCR-positive samples did not contain sarcocysts on initial histologic section, but additional sections from these samples revealed sarcocysts in an additional 12 samples. When combined, histology with additional sections and PCR detected 31 positive specimens of the 48 total specimens. We found no evidence of human pathogen S. hominis and confirm that cattle pathogen S. cruzi is highly prevalent in this regional sample. PCR assays may increase the detection sensitivity of Sarcocystis spp. and contribute diagnostic precision.

Document Type: Research Article

Affiliations: 1: University of Vermont, College of Medicine, Bington, Vermont 05401, USA; Mayo Clinic, Department of Laboratory Medicine and Pathology, Division of Clinical Microbiology, 200 1st Street S.W., Hilton Building, 4th Floor, Rochester, MN 55905, USA 2: University of Vermont, College of Medicine, Bington, Vermont 05401, USA 3: Animal Parasitic Diseases Laboratory, U.S. Departmyent of Agriculture–Agricultural Research Service, Beltsville, Maryland 20705, USA

Publication date: October 1, 2008

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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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