How to differentiate between type A and type B influenza

Influenza A and influenza B are two typical viral infections. Influenza A is an acute viral infection characterized by symptoms such as herpes, pneumonia, fever, and headache. Influenza B is also an acute viral infection, with main clinical features including fever, diarrhea, and headache. The most critical step in accurately diagnosing influenza A and B is performing appropriate virological tests on the patient, such as detecting viral antigens or antibodies in blood, serum, feces, or nasal swabs. Generally, a positive test result (indicating the presence of viral antigen or antibody) often confirms infection with influenza A or B, whereas a negative result suggests the possibility of other pathogens (such as bacteria or fungi). Pathological examinations can also confirm or rule out viral infections, for example, through light microscopy or electron microscopy of affected tissues. Finally, based on the patient's specific condition and test results, a comprehensive assessment can determine whether the infection is due to influenza A or B.