Most of the cases of influenza A positive are not serious, but it cannot be ruled out that a very small number of patients may have serious cases. The severity of influenza A positive mainly depends on the severity of symptoms caused by the viral infection to further analyze. 1. Non-serious cases: Most of the influenza A positive cases are respiratory diseases caused by viral infections, which occur every year, except that the degree of influenza is different. Early patients with symptoms similar to the common cold, will be accompanied by digestive symptoms, such as general muscle aches, body fever, runny nose, cough and other symptoms. For this type of patients, it can be improved by resting and taking Oseltamivir under doctor’s supervision, so the situation is not particularly serious. 2. Serious cases: A very small number of patients will have serious illnesses caused by influenza A virus infection. For patients with various underlying diseases, especially the elderly, influenza A virus infection will cause serious respiratory diseases, such as serious lung infections, and even respiratory failure and other problems. As these conditions are often caused by a decline in resistance or age, influenza A positivity in the elderly is a serious condition and should be taken very seriously. Patients suffering from influenza A should go to the local hospital in time to find out the problem as soon as possible and get treatment as soon as possible.