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Infection incidence of larval lung flukes, Paragonimus dehaani from Maruyama River in Hyogo Prefecture



Infection incidence of larval lung flukes, Paragonimus dehaani from Maruyama River in Hyogo Prefecture



Japanese Jour Vet Sci 19(1): 19-29



During the period May to Sept., 1956, 377 crabs were examined to determine the presence of Paragonimus larvae. Investigations were made on the form and distribution in the body of the crabs, the monthly variations in incidence, the relationship between the body weight of the hosts and the frequency, and the number of the parasites. Metacercariae were found in 86.7% (327). From these hosts a total of 5763 cysts of the larvae were recovered. Crabs harbored from 1 to 92. The average was 17.6. Their distribution in the body of the crabs is shown in a table with English legends. In the liver 96.7% were found, 1.7% in the gills, and 1.6% in the ovaries. The highest incidence of infection occurred in August (96.1%) and the lowest in July (75.6%). There was no evidence to show any remarkable seasonal variation in the incidence of the infection. The heavier the body weight of the host the more frequent the infection. The rate of infection was 73.2% in those 6-10 g in body weight, 89.9% in those 16-20 g in body weight, and 93.8% in those 26-30 g. All these larval lung flukes were identified as P. ohirai (Miyazaki, 1939). The eggs discharged by test animals (dogs, cats) fed on the larval flukes were so identified also. There is marked difference in the incidence of infection between these results and those of other authors. The mouth of the river studied appears to be a "hotbed" for P. ohirai.

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