Rotavirus vaccine is necessary. Rotavirus is highly contagious and is an orally transmitted disease, mostly seen in infants and young children. After infection with rotavirus, patients may have high fever, vomiting, diarrhea and other symptoms, and in severe cases, complications such as myocarditis and encephalitis may occur, which may be life-threatening. Therefore, rotavirus vaccine is necessary. Rotavirus vaccine is mainly used to prevent rotavirus gastroenteritis in infants and young children caused by serotypes G1, G2, G3, G4 and G9, as well as diarrhea. Adverse reactions such as transient mild vomiting, diarrhea, or transient fever may occur after vaccination, which usually lasts for 1~2 days and resolves on its own without treatment. Patients with known hypersensitivity to any components of the vaccine as well as excipients and gentamicin sulfate, immunodeficiency, immunocompromised, etc. need to be contraindicated. Patients are advised to go to a regular hospital and get the rotavirus vaccine under the proper operation of a doctor.