Legal basis: Article 39 of the Law of People's Republic of China (PRC) on the Prevention and Control of Infectious Diseases. Medical institutions should take the following measures in time when they find Class A infectious diseases: (1) isolate patients and pathogen carriers, and determine the isolation period according to the results of medical examination; (two) for suspected patients, isolation treatment in designated places before diagnosis; (3) Carry out medical observation and take other necessary preventive measures at designated places for patients, pathogen carriers and close contacts of suspected patients in medical institutions. The public security organ may assist medical institutions to take compulsory isolation treatment measures if they refuse isolation treatment or leave isolation treatment without authorization before the expiration of isolation period. Medical institutions should take necessary treatment and control measures according to the condition when they find patients with Class B and Class C infectious diseases. Medical institutions must, in accordance with the provisions of laws and regulations, disinfect and dispose of places, articles and medical wastes contaminated by infectious disease pathogens in their own units.