How to determine whether it is influenza A or influenza B infection

Laboratory tests can be used to determine whether the infection is caused by influenza A or influenza B. Viral samples need to be collected, and various methods are available for sample collection, such as obtaining sputum, blood, or nasal swabs. Viral detection can be performed using techniques such as PCR (polymerase chain reaction) or ELISA (enzyme-linked immunosorbent assay) to identify the viral genome structure, thereby determining whether the infection is due to influenza A or B. Additionally, immunofluorescence or serological techniques can be employed to identify the serological type of the virus and distinguish between influenza A and B infections. Viral isolation and cell culture techniques may also be conducted to confirm whether the infection is caused by influenza A or B.