In general, fish can be eaten after vaccination and is usually fine as long as it is clear that there is no allergy to fish and the food hygiene of the fish is assured. There is no evidence that eating fish after vaccination affects the effectiveness of the vaccine. For people who have already experienced allergic reactions such as redness and rash at the vaccination site, who are allergic themselves, and who are clearly allergic to fish, they should try to eat less fish or avoid eating fish after vaccination. On the one hand, this is because eating fish may trigger or aggravate adverse reactions in such people, and on the other hand, allergic reactions caused by eating fish may be confused with adverse reactions to vaccines, thus affecting the doctor’s judgment of the cause of the symptoms, which is not conducive to accurate diagnosis and treatment. Not only eating fish, but also other foods such as meat, fruits, vegetables, etc. do not affect the effect of the vaccine under normal circumstances. In conclusion, after vaccination, you can continue to maintain your normal eating habits, which generally do not affect the effect of the vaccine, and there are no clear restrictions on clean and non-allergenic foods.