Blood cancers that normally develop after three doses of the New Crown vaccine have nothing to do with the vaccine. Blood cancer is also known as leukemia. Since leukemia may be caused by various reasons such as viral infection, autoimmune disease, exposure to toxic substances genetically, etc., gene mutation occurs in the human hematopoietic cells, resulting in abnormalities in the process of generating hematopoietic cells. Since the body can produce a certain amount of antibodies against the new coronavirus after the first two shots of the new coronavirus vaccine, but the level of antibodies in the body may gradually decrease with the prolongation of the exposure time, the third shot of the new coronavirus vaccine is mainly intended for the body to be able to produce a more stable level of antibodies, which is more helpful in the prevention of the new coronavirus infection. Under normal circumstances, the new coronavirus vaccine does not affect the body’s hematopoietic system, so leukemia after three doses of the new coronavirus vaccine has nothing to do with the vaccine.