Oyamada, T., Y. Ohta, S. Noguti, N. Kudo & T. Yoshikawa. (1996). Assessments of three species copepods as the first intermediate host to Gnathostoma nipponicum, in Aomori prefecture, Japan. Japanese Journal of Parasitology. 45(3): 234-237.(Japanese).

106638

Oyamada, T., Y. Ohta, S. Noguti, N. Kudo & T. Yoshikawa

1996

45(3): 234-237.(Japanese)

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To assess the first intermediate host of Gnathostoma nipponicum in eastern Aomori Prefecture, an experimental study was carried out. Three species of cyclopoid copepods, Acanthocyclops vernalis (Av), Eucyclops serrulatus (Es), and Macrocyclops fuscus (Mf) collected from an endemic area of this parasite, were infected with the second-stage larvae hatched from the incubated eggs, and the larvae developed into the early third-stage (EaL3) in each copepod after 12 days of infection at 25°C. The infection and recovery rates differed among the copepods species, and those were 72.2% and 57.4% in Av, 53.5% and 39.5% in Es, and 17.0% and 10.6% in Mf, respectively. Additionally, the EaL3 recovered from Av and Mfdeveloped into the advanced third-stage larvae (AdL3) in loaches {Hisgurnus anguillicaudatus) used as the second intermediate host. From these results, it confirmed experimentally that new two copepods species, Av and Mf, can serve as the first intermediate hosts. And, it also suggested that three species of copepods reported here were important, at least, as the first intermediate hosts in the natural life cycle of G. nipponicum in eastern Aomori Prefecture.

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