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OPERCULAR CYST FORMATION IN TROUT INFECTED WITH Myxosoma cerebralis
1 Animal Science Department, University of Nevada, Reno, Nevada 89507, U.S.A.
2 Division of Laboratory Medicine, School of Medical Sciences, University of Nevada, Reno, Nevada
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.
Submitted on December 7, 1973
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