It is not recommended to go swimming immediately after vaccination, but you can swim after the injection site has healed and scabbed, but you should also pay attention to the length and intensity of swimming and keep warm to avoid catching cold. Swimming after vaccination may lead to wound infection, cold and aggravate adverse reactions to vaccines, etc. If improper warming measures lead to cold and fever, the vaccine protection effect will also be affected. 1. Wound infection: Try not to go swimming after vaccination until the injection site is scabbed over, because the wound may become infected and inflamed when exposed to water, resulting in redness, swelling, hard nodes and pain at the injection site. In addition, swimming pools are generally shared by many people, and the lack of cleanliness can easily breed bacteria and make it easier for various infections to occur. In addition, if the physical exertion and sweating when swimming, it may also cause wound infection; 2, cold: after the vaccination, the body’s immune system is in a more active state, and it is easy to have fever and other discomfort. The temperature of the swimming pool itself is low, so if you don’t pay attention to keep warm when swimming, it is easier to catch a cold or fever. At this time, it is impossible to determine whether it is a cold or an adverse reaction to the vaccine, and in addition, a cold may reduce the effect of the vaccine; 3. Aggravating adverse reactions: Both wound infection and cold and fever may aggravate the adverse reactions after vaccination, such as fever, swelling and pain at the injection site, and the vaccine protection effect may be weakened when the fever is serious. Other adverse reactions, such as dizziness, vomiting, and abdominal pain, may also be induced. Except for swimming, bathing is not recommended within 48 hours after vaccination, and eating less spicy and stimulating food to avoid gastrointestinal discomfort. Try to avoid staying up late, because staying up late will reduce the immunity of the body and affect the effect of vaccination.