Volume 20, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



The hybrids of four subspecies of were exposed to infection with miricidia of four strains of geographically related to the parent snails. The results permitted the postulation that when a strain of infects a snail, it will also usually develop in hybrids of which one snail parent is susceptible to infection. is susceptible to all strains of that infect man, while the Changhua race of is susceptible only to the Formosan (zoophilic) strain of the parasite. However, hybrids of these snails served as intermediate hosts for both the human and the zoophilic strains of the parasite. Infected hybrid snails survived twice as long as infected unhybridized snails. A lower infection rate and later shedding of cercariae was observed in hybrids and snails infected with unnatural geographical strains than in snails infected with geographically related strains.


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