"What triggers the immune system to fight a disease is as stated in the definition."
The definition you just made up on your own? Or what? I've asked where you even got that, since it isn't from any authoritative source I've seen and since it's about 40 years out of date. So where are you getting this out of date concept from?
"Using other means to trick the immune system into fighting a disease is completely different."
Presentation of an antigen to dendritic cells is the same method of immune response invocation across the board for all vaccines as well as pathogenic infection. The only difference is in how the antigen comes to be presented to the dendritic cells. Once the dendritic cells have the antigen, the process continues in identical fashion regardless of how it got there.
I didn’t make up the definition.. nice try though. Actually the one I posted was the first one that came up. There’s tons of sources for the definition of a vaccine but here’s a couple:
https://medical-dictionary.thefreedictionary.com/vaccine
One of many listed: a. A preparation of a weakened or killed pathogen, such as a bacterium or virus, or of a portion of the pathogen’s structure that upon administration to an individual stimulates antibody production or cellular immunity against the pathogen but is incapable of causing severe infection.
https://www.vaccines.gov/basics
A vaccine is made from very small amounts of weak or dead germs that can cause diseases — for example, viruses, bacteria, or toxins. It prepares your body to fight the disease faster and more effectively so you won’t get sick.
This site also list the mRNA “vaccine” as a type but as listed it doesn’t meet the definition they list.
I get how the Pfizer and Moderna shots work.
Both the Pfizer-BioNTech and the Moderna COVID-19 “vaccines” use messenger RNA (mRNA). Coronaviruses have a spike-like structure on their surface called an S protein. COVID-19 mRNA “vaccines” give cells instructions for how to make a harmless piece of an S protein. After vaccination, your cells begin making the protein pieces and displaying them on cell surfaces. Your immune system will recognize that the protein doesn’t belong there and begin building an immune response and making antibodies.
I believe in the definition I listed so I don’t see this as true vaccine. It’s a hybrid treatment that may act like a vaccine but not a true vaccine.