Whether anemia can be vaccinated depends on the degree of anemia and the cause of the disease, and requires specific analysis for each case. In general, mild anemia can be vaccinated, but if the anemia is moderate or severe, the anemia should be corrected before vaccination. 1. mild anemia: it does not affect the vaccination, and the vaccination can be routinely administered, which generally does not have much effect on health. 2. moderate anemia: it is recommended to find out the cause of the anemia first, and if it is iron deficiency anemia, the moderate anemia can be corrected by supplementing iron and iron-rich food. If the anemia is iron-deficiency, iron supplements and iron-rich foods can be used to correct the moderate anemia. This will ensure the safety of the patient and also ensure that the patient produces protective antibodies after the vaccination; 3. Severe anemia: vaccination is not recommended. Because in severe anemia, the human brain, heart, lungs and other important organs will be greatly affected, and may even cause anemic heart failure and affect the human immune function. If the vaccination is given at the time of severe anemia, the normal immune response cannot be stimulated due to the decrease in immune function, and thus the body cannot produce the protective antibodies it needs. Therefore, in patients with severe anemia, it needs to be aggressively corrected and, if necessary, transfused with concentrated red blood cells to relieve the anemia. It is safer to wait until the anemia symptoms are corrected before administering the vaccine.