The new crown vaccine is non-toxic. At present, there are 3 types of New Crown vaccines inoculated in our country, which are as follows: 1. Inactivated vaccine: By killing the New Crown virus after culturing and amplifying it, and then injecting the inactivated virus into the human body to induce the body to produce an immune response, this kind of vaccine is non-toxic and harmless to the human body. 2. Adenovirus vector vaccine: it refers to the use of adenovirus as a vector, the new coronavirus antigen gene is injected into the body of adenovirus, the new coronavirus antigen gene will not replicate itself, and has no disease-causing ability, but it can express the protein antigen of the new coronavirus, stimulate the human immune system to produce antibodies, so this vaccine is also non-toxic and harmless. 3. Recombinant protein vaccine: that is, through genetic engineering in engineering cells to express the purified pathogen antigenic protein, and then prepared into a vaccine, is also non-toxic and harmless to the human body. Therefore, the new crown vaccine itself is non-toxic and harmless, but there is no guarantee whether the components in the vaccine will induce corresponding allergic reactions and adverse serious events in different individuals. The presence of contraindications to vaccination should be assessed before injection, and close observation should be made after injection, so that any adverse reactions can be promptly treated by a doctor.