The first thing is that many vaccinated children will have a slight fever, which is often a normal reaction after vaccination. If there is no abnormality, the child’s fever temperature is not particularly high, just pay attention to monitoring the temperature, and give the child more water or use anti-viral Chinese medicine for treatment. The recommended ones are the antelope horn granules or pediatric black bean and fever granules, which not only have a mild antiviral effect, but also have a certain fever-reducing effect. If the child has heavy fever and poor mental status, serious leprosy virus infection cannot be ruled out, so he or she needs to go to the hospital for specific examination and treatment as soon as possible. Although the vaccine is an inactivated virus, it can also easily induce infection to occur in cases where the child’s resistance is hot or not quite normal, which is also more dangerous.