title: A study on the prevalence of soil transmitted helminths among lettuce leaves sold in local markets in Penang, Malaysia.
mesh_terms: D000723:Ancylostomatoidea / Q000302:isolation & purification; D000818:Animals; D001200:Ascaris / Q000302:isolation & purification; D006376:Helminths / Q000302:isolation & purification*; D007814:Larva; D008296:Malaysia; D012987:Soil; D014119:Toxocara / Q000302:isolation & purification; D014258:Trichuris / Q000302:isolation & purification; D014675:Vegetables
chemical_list: D012987:Soil