The date of isolation is usually counted from the day of isolation. The date of isolation is not counted from the 2nd day of isolation, but from the day of isolation. The usual term isolation usually refers to isolation set up to avoid contagious diseases. It may be in the form of home isolation or centralized isolation. The specific form and duration of isolation should be in accordance with the regulations of the relevant authorities. The purpose of isolation is to prevent the spread of infectious diseases. In order to prevent infectious diseases, quarantine measures should be taken. Other preventive methods are wearing masks, vaccinations, etc. In general, it is necessary to strengthen the body’s physical fitness and increase the ability to resist diseases. The quarantined people should follow the doctor’s advice during the quarantine time, and they should not go out casually to avoid the spread of infectious diseases, and they should unite to fight against the epidemic.