It is recommended that people who have no adverse reactions to the vaccine eat seafood for at least 3-5 days and pay attention to the appropriate amount to help reduce the chance of adverse reactions in the organism. In addition, allergy to seafood is contraindicated. The main reasons for this are as follows: First, after entering the body, vaccines stimulate the immune system to produce immune effect molecules and cells, thus preventing diseases for a certain period of time. Within 3-5 days of vaccination, the body’s immune system is in a strong reaction stage, and eating seafood at this time may induce adverse reactions such as diarrhea, rash, allergy, etc. Secondly, since some of the common adverse reactions to vaccines, such as fever, rash, diarrhea and weakness, are similar to allergic reactions after eating seafood, it is easy to confuse the cause of the above adverse reactions and cause misdiagnosis and delay in treatment. In addition, if adverse reactions occur after vaccination, eating seafood at this time may aggravate the above symptoms and may indirectly affect the immune effect molecules and cells produced by the vaccine in the body, thus affecting the vaccination effect. Therefore, it is recommended to eat seafood at least 3-5 days after vaccination without adverse reactions, when the chance of discomfort is also relatively small. In addition, it is important to note that adverse reactions may occur up to 1 week after vaccination, so pay attention to good observation and watch out for any discomfort when eating seafood. If there are mild local reactions such as skin redness, swelling, pain and weakness after vaccination, they can be relieved by taking more rest, drinking more water, eating a light diet, avoiding stimulating spicy food and ensuring sleep at night without staying up late. If the reaction is not relieved, or if systemic symptoms such as fever, headache, or diarrhea appear, prompt medical treatment is required.