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Studies on the lung fluke paragonimus westermani diploid type in the northern part of hyogo prefecture japan vi. experimental oral infection of wild boars and pigs with the metacercariae



Studies on the lung fluke paragonimus westermani diploid type in the northern part of hyogo prefecture japan vi. experimental oral infection of wild boars and pigs with the metacercariae



Japanese Journal of Parasitology 35(4): 303-312



Three wild boars and three pigs were orally infected with the metacercariae of the diploid type of P. westermani to observe the growth and development of the worms obtained and compare the infectivity to those hosts. The results were then compared with those of experiments using the metacercariae of the triploid type of P. westermani by Miyazaki and Habe (1975) and Habe (1978). In pigs the worms were mostly recovered from the muscle and most of them were juvenile type, and few worms were from the pleural cavity. Contrary to this, in wild boars 16(23.2%) of the worms detected were recovered from the plerual cavity, among them, 12 worms (17.4%) were from the lung tissue or cysts in lungs. Those worms, however, were less develoepd and even those from cysts in lungs were immature or pre-adult type. In comparing the diploid type with the triploid type, contrary to the result which showed the worms of the triploid type mostly staying in the muscle of wild boars and pigs for a long time (Miyazaki and Habe, 1975), the worms of the diploid type were recognized to have a stronger tendency to penetrate the pleural cavity of wild boars and form worm cyst than those of the triploid type. Judging from the facts, it is presumed that the diploid type of P. westermani is more infective to wild boars than the triploid type. However, it is concluded that wild boars are not very suitable hosts for either the diploid type or the triploid type. In the present research, experimental oral infection of dogs or a cat with the juvenile worms from the muscle of a wild boar and pigs was successful in the recovering of adult or almost matured pre-adult worms. Hence it is presumed that both hosts can serve as paratenic hosts of the diploid type of P. westermani as well as of the triploid type.

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