How can parents determine whether a child has influenza A or influenza B?

To accurately determine whether a child has influenza A or influenza B, relevant examinations and medical diagnosis are required. The symptoms of influenza A and influenza B are similar, but the influenza A virus spreads more rapidly than influenza B, so patients may develop symptoms more quickly and often experience prominent systemic symptoms such as headache, vomiting, and diarrhea. Samples such as throat swabs, nasal swabs, and blood can be collected for viral testing to confirm whether the child is infected with influenza A or B virus.