Sarcocystis nesbitti

Sarcocystis nesbitti is a species of protozoon.
An outbreak investigation was conducted on 93 symptomatic persons from Malaysia following a college retreat on January 17–19, 2012, on Pangkor Island. Predominant manifestations were fever (relapsing in ≈50% of patients), myalgia, headache, and cough. Although only 2 patients were confirmed to be acutely infected with S. nesbitti, it was likely that the remaining students and teachers in the group had the same infection because nearly all had similar signs and symptoms with onset of illness within days of each other. In addition, 9 patients had a distinctive facial myositis, but sarcocysts could not be verified in all of them because only 3 patients agreed to provide a muscle biopsy specimen.