Schistosoma mansoni (two Puerto Rican strains) in:
• Exposed Biomphalaria glabrata snails
• Swiss-Webster mice or LVG hamsters

Schistosoma haematobium (Egyptian strain) in:
• Exposed Bulinus truncatus truncatus snails
• LVG hamsters

Schistosoma japonicum (Philippine or Chinese strain) in:
• Exposed Oncomelania hupensis quadrasi snails (Philippine strain)
• Exposed Oncomelania hupensis hupensis snails (Chinese strain)
• Swiss-Webster mice