title: Problems in adequately immunizing international travellers.
mesh_terms: D000328:Adult; D002771:Cholera / Q000517:prevention & control; D004306:Dose-Response Relationship, Immunologic; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007114:Immunization; D008297:Male; D011247:Pregnancy; D012306:Risk; D014195:Travel; D014435:Typhoid Fever / Q000517:prevention & control; D015004:Yellow Fever / Q000517:prevention & control