セタリア成虫による牛膀胱の好酸球性肉芽腫の発生

抄録

A pathologic study was performed on parasitic lesions found in the urinarybladder of cattle. Grossly, these lesions were curved, linear antd sclerotic. Microscopically, they were nodular, granulomatous lesions with parasites at their center, presenting featurescharacteristic of exudative inflammation with marked infiltration of eosinophils, in rela-Lively fresh cases. In contrast, they were characterized by tire infiltration of giant cellsand phagocytes, as well as by the follicular proliferation of lymphocytes, in long-standingcases.The parasite found in tlae tissue of the urinary bladder bore morphological resemblancein manay respects to Selaria digitata isolated from the abdominal cavity of cattle in a districtwhere intra-abdominal infection with this worm showed an incidence as high as 55%.The worms isolated from lesions in the urinary bladder of two of the infected cattle wereidentified as Setaria digitata.These results indicate that the lesions were caused by adult worms of Setaria digitalaoriginally harbored in the abdominal cavity and accidentally entering the wall of tlaeurinary bladder.