Positive for influenza A virus suggests the presence of influenza A virus infection in the body. Influenza A is an acute respiratory infectious disease caused by influenza A virus, which is highly contagious. Influenza A virus is mainly transmitted through respiratory droplets, but can also be transmitted through direct contact with the patient’s oral and nasal secretions or indirect contact with daily utensils, such as towels and clothing, that are contaminated by the virus. After infection, fever, sore throat, runny nose, nasal congestion, coughing and sputum, headache, and even generalized muscle pain, and some patients may even vomit, diarrhea and other digestive symptoms. A small number of patients can also be complicated by bacterial upper respiratory tract infection, bronchitis, bronchitis, bacterial pneumonia, toxic shock, toxic myocarditis and other diseases, which can lead to death in severe cases. Application of the specific antiviral drug oseltamivir within 48 hours of the onset of influenza A can significantly reduce symptoms, shorten the duration of illness, and effectively reduce the chance of complications. In case of suspected influenza A virus infection, it is recommended to visit a hospital promptly for a clear examination and to actively cooperate with the doctor for treatment.