| spontaneous larval gnathostoma nipponicum infection in frogs. | from june 1993 to september 1997, a survey was carried out for the prevalence of larval gnathostoma nipponicum infection in several kinds of frogs, toads, and their tadpoles collected from an endemic area of this nematode in aomori prefecture. two frog species, one of 436 (0.2%) rana nigromaculata and 51 of 147 (34.7%) r. catesbeiana were infected, and a total of 446 advanced third-stage larvae (adl3) of g. nipponicum were recovered. these results confirmed that two frog species which can serve ... | 1998 | 9795906 |