The fever in children after vaccination is a normal vaccine reaction. The vaccine itself is an attenuated or inactivated virus, which is an antigen that enters the body to induce the body to produce antibodies, and this reaction may cause fever at the same time! Of course, this varies from person to person, good health may not appear such a problem, bad health or during the vaccination of infants and children appear obvious symptoms of discomfort, then it is easy to cause fever. 1. Regardless of the cause of the fever, when the body temperature exceeds 38.5℃, we need to give ibuprofen or acetaminophen to reduce the fever in time, because once this temperature rises again, it may cause the child to have a convulsion. 2.The duration of vaccine reaction is basically about 2~3 days, and the temperature will not exceed 39℃, but when the temperature frequently exceeds 39℃ and lasts for more than 3 days, it should be considered to be secondary to other infections, so we need to take the child to the hospital for routine blood test and give corresponding symptomatic treatment. 3, may also be accompanied by diarrhea or nasal congestion and runny nose symptoms, then give the corresponding treatment can be. Diarrhea symptoms with probiotics; if the number of stools is greater than 4 times, you can add montelukast. If the symptoms of nasal congestion and runny nose are accompanied, physiological sea saline can be given to rinse the nasal cavity, and in serious cases, corresponding cold medicine or anti-allergy medicine can be given. 4.If a rash appears after the vaccine, you can apply localized glyburide lotion, basically it should be able to slowly relieve in about 7 days.