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Comparison of single worm infection of cats with paragonimus westermani and paragonimus pulmonalis



Comparison of single worm infection of cats with paragonimus westermani and paragonimus pulmonalis



Medical Bulletin of Fukuoka University 8(4): 405-416



Five cats were each infected with 1 metacercaria of P. pulmonalis (Baelz, 1880) Miyazaki, 1978, the parthenogenetic type, collected from Eriocheir japonicus in Kyushu [Japan]. Another 5 cats were each infected with P. westermani (Kerbert, 1878) Braun, 1899, the bisexual type, from Geothelphusa dehaani in Honshu, Japan. The cats were killed 120-250 days postinfection, and 9 adult worms were recovered. After eggs were laid in Ringer's solution, they were fixed, stained with alum-carmine, and mounted in permount. The laid eggs were incubated at 27.degree. C for .apprx. 1 mo., and maturity was examined. P. pulmonalis was fully mature in all cats, and had numerous eggs in the uterus. No sperm were recognized in the male reproductive organs and seminal receptacle except for a small number of abnormal sperm in the former. Of the 5 adult worms, 4 were parasitic in lung cysts, and the remaining 1 was in the pleural cavity. Adult P. pulmonalis lived singly in the cyst without pairing and laid many viable eggs in 4. This fluke exhibits self-fertilization. The eggs laid in Ringer's solution showed a high rate of maturation, except for those of 1 worm. The miracidia hatched easily and swam actively in water. Foyr adults of P. westermani were recovered from 4 of 5 cats. They were much smaller than P. pulmonalis, but were mature, containing eggs in their uterus. They had numerous sperm in the male reproductive organs, but none in the seminal receptacle. P. westermani sperm do not pass into the seminal receptacle. Adult P. westermani were found crawling in the pleural cavity without encysting, and laid eggs in the cavity as well as in some parts of the lung tissue, where bisexual flukes exhibit cross-fertilization. The eggs laid by animated P. westermani hardly developed, and the miracidia were smaller and did not hatch. A single adult P. pulmonalis can encyst and lay many viable eggs without pairing. P. westermani does not encyst unless it mates, because cross-fertilization is indispensable for the fluke to lay viable eggs. The biological differences between the 2 spp. can be recognized in human paragonimiasis.

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Accession: 005012234

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