Some infants may develop a brief fever and transient rash on day 6-10 after leprosy vaccination, but the duration of the fever varies from person to person, but generally does not exceed 2 days. Leprosy vaccine is given to prevent infection with leprosy virus. Some infants develop immune symptoms of fever after leprosy vaccination, but most of them can be relieved on their own, so parents do not need to panic too much. If the temperature exceeds 38.5 degrees, go to a community clinic or hospital for symptomatic treatment and do not use random medication. If the body temperature does not exceed 38.5 degrees, physical cooling can be used by wiping the body surface with warm water or alcohol to water, and usually the fever does not exceed 48 hours. Babies should not be bathed for 3 days after leprosy vaccination to avoid inflammation of the needle opening. You should drink more water, take more rest, and pay attention to keeping warm and not getting cold. In case of serious adverse reactions, seek medical attention promptly.