Individual countries have mandatory requirements, and all entry personnel must provide health certificates. According to the "Regulations on Health Examination for Entry-Exit Personnel" issued by the Ministry of Health and the Ministry of Public Security, "overseas students, advanced students, businessmen, technical cooperation, visiting relatives, exporting labor services, aiding foreign countries, and settling abroad must go to the health and quarantine organ for health examination, vaccination, and obtain health certificates and international vaccination certificates, which must be presented to the health and quarantine organ before leaving the country."