title: When should I use an insect repellant?  Which one is best?
mesh_terms: D000818:Animals; D003671:DEET / Q000008:administration & dosage*; D006801:Humans; D007302:Insect Repellents / Q000008:administration & dosage*
chemical_list: D007302:Insect Repellents; D003671:DEET