If the patient is not allergic to fish and has no uncomfortable reaction to the vaccine, there is usually no effect and observation can be made without special treatment. However, if the patient has severe diarrhea, itching, erythema and other discomfort, it is recommended to go to the hospital for treatment in time. Patients can drink some plain water several times in small amounts to accelerate the metabolism of the body. If the patient is usually prone to allergy to foreign proteins and has uncomfortable reactions such as nausea, diarrhea, redness and pain at the injection site after vaccination with the new crown vaccine, eating fish after vaccination may cause the existing discomfort to worsen, and he or she should go to the hospital promptly and receive anti-allergy treatment if necessary. Patients should pay attention to avoid eating spicy food, fish and shrimp for 2-3 days after vaccination in the future. Pay attention to rest, quit smoking and alcohol, and avoid strenuous exercise.