I really don't have any symptoms. My temperature is below 37 degrees. After clinical observation, the incubation period of 7 days has passed. I guess I can get a diagnosis certificate. If not, try to write it down and stamp it with paper. Name, sex and age diagnosis: acute upper respiratory tract infection? Suggestion: After 7 days of home isolation treatment, the body temperature returned to normal and the clinical symptoms disappeared, so you can go to school. Doctor's signature, year, month and day.