Sarcocysts were found in striated muscle of 21 adult wading birds among 145 examined grossly and 70 examined histologically (calculated prevalence = 24%), and in none of 332 immature wading birds examined from Florida (USA). Six of 12 species of ciconiforms were infected (Ardea herodias, Casmerodius albus, Egretta caerulea, Nyctanassa violacea, Butorides striatus, Eudocimus albus). Cysts were filamentous, usually extended the entire length of the muscle fiber, and were visible grossly in 33% of the positive cases. We concluded from ultrastructural examination of cysts that the same species of Sarcocystis may occur in all species of wading birds in Florida; however, two cyst diameters were noted that appeared to differ in their distribution by host species.
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Vol. 30 • No. 1