title: Inexpensive biological control of schistosome transmission in Montebello, Puerto Rico.
mesh_terms: D000818:Animals; D003362:Cost-Benefit Analysis; D006790:Host-Parasite Interactions; D010572:Pest Control, Biological / Q000191:economics; D011647:Puerto Rico; D012550:Schistosoma mansoni / Q000302:isolation & purification*; D012908:Snails / Q000469:parasitology*