According to the Law of the People's Republic of China on the Prevention and Control of Infectious Diseases, workers involved in catering and food production are required to have a valid health certificate. Health certificates are issued by the health department and have a certain validity period. Generally speaking, health certificates are valid for half a year. However, the exact validity period also depends on the relevant local regulations.

In our daily lives, we should have regular medical checkups and renew our health certificates in a timely manner. At the same time, workers should also pay attention to the intake of safe food, to protect their own health and reduce the risk of disease transmission.