title: Guidelines for spacing and timing of samples to detect populations of Schistosoma mansoni cercariae in the field.
mesh_terms: D000818:Animals; D001700:Biomphalaria / Q000469:parasitology; D008124:Locomotion; D008722:Methods; D011153:Population; D012550:Schistosoma mansoni / Q000502:physiology*; D013997:Time Factors; D014867:Water
chemical_list: D014867:Water