The surveillance of communicable diseases of national importance.
D003141:Communicable Diseases; D006505:Hepatitis; D006506:Hepatitis A; D006801:Humans; D007251:Influenza, Human; D008288:Malaria; D011051:Poliomyelitis; D011315:Preventive Medicine
HEPATITIS, INFECTIOUS; INFLUENZA, ASIAN; MALARIA; POLIOMYELITIS; PREVENTIVE MEDICINE