The vaccine is a biological agent, and reactions such as fever and allergy may occur after the injection. After vaccination, avoid eating seafood as much as possible, because seafood foods are prone to allergic reactions, which may cause adverse reactions or aggravate adverse reactions: 1. Causing adverse reactions: Due to the presence of foreign protein components within seafood, people with allergies are prone to allergic reactions of the organism by eating seafood. Therefore, after vaccination, in order to prevent allergic reactions to the vaccine itself due to seafood allergy and the appearance of allergic rash and wind mass, it is recommended to avoid eating seafood as much as possible in non-essential cases; 2. aggravate adverse reactions: after vaccine is injected into the body, it will stimulate the immune system of the organism and induce tissue cell damage and specific immune response of the physiological dysfunction of the organism, and for people who are prone to allergic constitution For people who are prone to allergies, adverse reactions such as dizziness, headache and weakness may occur after vaccination, and even symptoms such as redness, swelling, pain, hard nodes or itching at the vaccination site may occur. Eating seafood after vaccination may cause cross-allergic reactions and aggravate the adverse reactions caused by vaccination. However, for people with non-severe allergies, eating small amounts of seafood after vaccination may not cause adverse effects either. However, in case of allergic reactions or other dangerous situations, aggressive treatment is required. In order to avoid unnecessary medical treatment, it is recommended to follow the relevant precautions after vaccination.