It is a vaccine and the definition at the bottom of the page shows just what I said… the percentage of immunity is the only question. Vaccines are never 100% immunity in their effectiveness. Some vaccines are really good and have 90+% effectiveness at total prevention. Others like Covid may not have prevention as good as 90% but many people have no reaction or symptoms after being vaxxed for Covid. Everyone benefits from the reduced impact of Covid when they have been vaxxed. All immune systems are different and so are the impact to them. The recognition of invading antibodies is what the Covid vaccine accomplishes. This is why some get hit harder than others based on the personal immune responses. The Covid vaccine essentially gives our immune system recognition of an invading antibody molecules are starting. Covid is real sneaky and fools our immune response until it is too late for some.

The problem with Covid is that it attacks our immune system and massively replicates before our immune system recognizes there is even a problem. Then our immune system overreacts and has a huge response to try to fight of this mass replication. This is why some people can’t handle our own immune response and our own response hurts us and people die. When you vaccinate for Covid you only give our immune system a recognition of invading antibodies and our personal immune response acts right away and doesn’t have to catch up with a massive response. How our individual immune response reacts is why there are differences in the impact of Covid.


vac·cine
/vakˈsēn/
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noun
a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease.