Influenza B infection is most contagious during the first 2-3 days of illness, and is contagious for the duration of the illness. Influenza B can be fully recovered in about 1 week with aggressive medication, which means that the contagiousness will last for about 1 week. Therefore, it is important to isolate patients and treat them actively with medication. Influenza infection is mainly characterized by fever, body weakness, muscle aches and pains, and gastrointestinal irritation symptoms, which can be treated with antipyretic and analgesic drugs. Anti-viral drugs can be applied amantadine, ribavirin, coughing, cough expectorant drugs, if combined with bacterial infection will have coughing yellow sputum, should also use antibiotic drugs, during treatment must drink more water, more rest.