Abstract
Several weanling piglets reared in a piggery of Kagawa Prefecture showed bloody and watery diarrhea. Pathological examination on 3 of the piglets revealed fibrinous and hemorrhagic ceco-colitis with intramural infestation of many amoebic trophozoites measuring 13-18μm in diameter. The amoebas were stained positively with PAS, Heidenhein's iron hematoxylin, and immunostaining (PAP method) using specific antibody against Entamoeba histolytica. Ultrastructurally, the trophozoites contained many and large cytoplasmic vacuoles and numerous ribosomes in the absence of mitochondria and Golgi apparatus. Feces of sows and feeder pigs raised in the farm frequently contained many amoebic cysts, which multiplied and were serially passaged on Tanabe-Chiba medium. Some of the cysts had two or four nuclei. Indirect hemoagglutination reaction of sera from 39 sows and 16 feeder pigs of the farm demonstrated positive antibody titers (<160) in 3 sows (7.7%) and 6 feeder pigs (37.5%).
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