Can common fever test antigen be positive?

The general fever antigen test is not always positive.

Taking the detection of influenza antigen as an example, samples were taken from the patient's pharyngeal isthmus through throat swab to detect influenza virus antigen and typing, and combined with blood routine, CRP (high-sensitivity C-reactive protein determination), SAA (serum amyloid A) and other joint detection means. In this project, it can be preliminarily determined whether the fever is caused by influenza virus and secondary bacterial infection of influenza virus within a short time of 15 to 20 minutes, which will point out the direction for clinicians to use anti-infective drugs.

So far, the new nucleic acid detection of coronary artery lesions is the gold standard, and its accuracy, sensitivity and specificity are close to 100%. In contrast, the sensitivity of antigen detection is slightly poor. Only when the virus grows and reproduces and the symptoms of mucosal infection are serious, there are generally fever and cough, and the positive rate can reach 70%-80%. For example, the positive rate of multiple antigen tests can exceed 95%, but not all of them are positive. But compared with nucleic acid detection, antigen detection has the advantages of short time and high coverage.