The composition of the first and second doses of the vaccine is the same, but the manufacturers may be different.
There are more types of vaccines, and for vaccines that require multiple injections, choosing a type with the same composition is more likely to stimulate the body to produce the appropriate antibodies that will protect the body. Vaccines with different ingredients may stimulate the body to produce fewer antibodies.
Currently, the New Crown vaccine is more commonly used. There are three types of vaccines, inactivated, recombinant and adenovirus vector vaccines, and the three types of vaccines should not be mixed. It is required that the first and second doses injected have the same ingredients, preferably from the same manufacturer.
After the first dose of inactivated vaccine, the second dose of inactivated vaccine is also required. Even if the vaccine from the same manufacturer is not available, the inactivated vaccine from another manufacturer needs to be used, and recombinant vaccine or adenovirus carrier vaccine cannot be used.
When administering the vaccine, you need to consult the doctor at the injection site to choose the appropriate type of vaccine to administer.