In a recent survey in Oklahoma (USA), 52 free-ranging coyotes were examined
for the presence of sarcocysts. Two of these coyotes were found infected w
ith sarcocysts in skeletal muscle. By light microscopy, the cyst wall was t
hin and smooth. Ultrastructurally, the cyst wall had minute villar protrusi
ons. The sarcocysts were 14.4 to 50.4 mum wide and 46.8 to 99 mum long. Thi
s is the first report of Sarcocystis sp. sarcocysts in the skeletal muscle
of coyotes.