Recently, many mothers in the clinic have asked whether their children can be vaccinated against measles when they are sick. The measles vaccine is a very safe product and generally has no special contraindications, but people with a history of allergy to chicken egg protein should be used with caution. Vaccination should be withheld for people with fever, acute infectious diseases, active tuberculosis, and a history of other serious allergies. Those who have been injected with immunoglobulin should receive this vaccine at least 1 month apart. The vaccine is similar to clinically used drugs, and while obtaining immune protection, there will be a combination of symptoms caused by the inherent characteristics of the vaccine itself, such as fever and local redness, which may be accompanied by general malaise, lethargy, loss of appetite, and fatigue; or the recipient is in the incubation period or prodromal period of a disease at the time of vaccination and has a coincidental attack after vaccination. After vaccination, the vaccinated person should stay at the site for more than 30 minutes and leave only if there is no abnormal reaction. 24 hours, if abnormal conditions occur, such as fever, incessant crying or lethargy, twitching, poor facial color, etc., contact the vaccination doctor promptly and deal with them in a timely manner.