External opercular cysts were observed in cutthroat trout, Salmo clarki henshawii affected with whirling disease. Microscopic examination of the cysts revealed numerous spores of Myxosoma cerebralis in their lumen and walls. Rupture of these cysts may provide a method of whirling disease transmission from live infected fish.
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1 October 1974
OPERCULAR CYST FORMATION IN TROUT INFECTED WITH Myxosoma cerebralis
ROBERT E. L. TAYLOR