What medication should a two-and-a-half-year-old child take for influenza B?

After a 2.5-year-old child is infected with influenza B, antiviral medications such as oseltamivir phosphate granules should be used under the guidance of a doctor. This medication effectively inhibits the activity of the influenza B virus, alleviates symptoms, and shortens the duration of illness. Additionally, if the child develops high fever, antipyretics such as acetaminophen or ibuprofen may be administered according to medical advice for symptomatic treatment. Furthermore, parents should pay attention to the child's diet and rest, maintain indoor air circulation, and avoid contact between the child and other infected individuals to prevent cross-infection.