Volume 90, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



is an intracellular protozoan parasite found as sarcocysts within muscle fibers of intermediate hosts (monkey and baboon). The definitive host is suspected to be the snake. We report two cases from a larger cohort of 89 patients who had fever, headache, and generalized myalgia after a trip to Pangkor Island, Malaysia. Sarcocysts were detected in skeletal muscle biopsy specimens by light and electron microscopy from these two patients. DNA sequencing based on the 18S ribosomal DNA region identified the species as . We also identified sequences in the stools of a snake (). Phylogenetic analysis showed that these sequences form a cluster with most of the other known species for which the snake is a definitive host. We believe these two patients were likely to have symptomatic acute muscular sarcocystosis after infection that may have originated from snakes.


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  • Received : 05 Nov 2012
  • Accepted : 05 Aug 2013
  • Published online : 05 Feb 2014

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