What are the two courtyards and four periods of history in COVID-19?

COVID-19 code is health code and travel code, and the four histories are contact history, travel history, contact history and medical history.

One code is a personal QR code generated by comparing personal declaration with background big data information based on personal health data. Every time citizens scan the code, personal identification information, such as ID number, name and nucleic acid test results, will be displayed on the health code. Risk level information, such as red team for high risk, yellow code for medium risk, and green code for low risk or no risk.

COVID-19 epidemic prevention and control measures:

1, attention should be paid to holiday arrangements: reduce personnel flow, reduce travel risks, reduce crowd gathering, and strengthen personal protection.

2. Pay attention to transportation: do not leave the country, do not gather, and do not go to medium and high risk areas.

3, shopping and entertainment should pay attention to: stay less when going out at the wrong peak, stick to a distance of one meter, and don't touch frozen food with your hands.

4. Pay attention to visiting relatives and friends: visit relatives and friends less, don't hug or shake hands, meet quickly and go back quickly.

5. Pay attention to going out for dinner: family dinners should be reduced and public chopsticks should be promoted.

Refer to the above content: Baidu Encyclopedia-novel coronavirus? Fromtitle= COVID-19 epidemic &; fromid=55509470