International problems of communicable-disease control.
D002353:Carrier State; D002771:Cholera / Q000517:prevention & control; D003140:Communicable Disease Control; D003906:Developing Countries; D006801:Humans; D007114:Immunization; D007391:International Cooperation; D012899:Smallpox / Q000517:prevention & control; D014438:Typhus, Epidemic Louse-Borne / Q000517:prevention & control; D014611:Vaccination; D014944:World Health Organization; D015004:Yellow Fever / Q000517:prevention & control