Common fever generally refers to the fever caused by non-new coronavirus infections, non-new coronavirus infections caused by fever new coronavirus nucleic acid test will not be positive, nucleic acid test generally has a certain specificity, only for new coronavirus infections. 1. There are many causes of common fever, such as common cold, influenza and other viral infections, various bacteria, mycoplasma, chlamydia and other pathogenic microorganisms; the above pathogenic microorganisms can lead to fever after infection, but the nucleic acid test for new coronavirus will not be positive. 2. Nucleic acid test only detects the genetic information of the new coronavirus. If the patient is in a medium-high risk area, and in a close or sub-close group of people, the nucleic acid test can be positive after the patient develops a fever, which is somewhat specific. Fever during the epidemic needs extra vigilance and attention, you should go to the hospital for examination, and you can not use drugs indiscriminately.