After the MMR vaccination if the weather is hot, you can blow the fan in moderation, which can prevent the body from excessive sweating causing infections and other occurrences, but you should avoid catching a cold by blowing the wind violently. MMR vaccination can prevent the body from being infected with measles, rubella and mumps viruses. After receiving this vaccine, the body may experience adverse reactions such as mild fever, pain at the vaccination site, and scattered skin rashes. At this time, if it is too hot, you can blow air moderately to prevent sweat from infecting the needle holes as well as scattered rashes on the body. After receiving MMR vaccination, the body’s immune function may experience a transient relative hypofunction, and care should be taken not to catch a cold or develop other diseases at this time. Therefore, fans should not be blown excessively to prevent the occurrence of colds. Drinking a moderate amount of water in hot weather will help the body’s metabolism.