The fever symptoms of omikron infection are atypical, and therefore the spread of the virus is more insidious. In terms of clinical manifestations, omicronjon infections are similar to upper respiratory tract infections caused by other viruses and lack specific manifestations, which makes clinical differential diagnosis difficult and makes the spread of the virus more insidious. Fever after omicron infection is not different from that caused by other upper respiratory tract infections, and it is not possible to distinguish omicron from other viral infections by the characteristics of the fever. If fever occurs, it is recommended to go to the hospital promptly for treatment, and a new coronary nucleic acid test can be performed to confirm omicron infection.