title: Natural helpers.
mesh_terms: D002170:Canada; D003140:Communicable Disease Control; D003153:Community Health Services / Q000458:organization & administration; D017280:Condoms / Q000600:supply & distribution; D015658:HIV Infections / Q000517:prevention & control; D006379:Helping Behavior; D006801:Humans; D018671:Needle-Exchange Programs