CDC definition but they change daily: Vaccination is the process of introducing a vaccine into the body to produce immunity to a specific disease. Vaccines are usually administered through needle injections but can also be administered by mouth or sprayed into a nostril.
I could be wrong but I thought immunity meant immunity.
Guess I should be careful about the polio vaccine... probably only a mild case if exposed.
The polio vaccine requires four doses before one is considered “fully vaccinated”. Efficacy is near 100% at that point. It’s the most effective vaccine available.
Efficacy for the smallpox vaccine is 95%. The seasonal flu vaccine is 40-60% effective depending on the year. The MMR vaccine is 97% effective against measles and 88% effective against mumps.
Every human’s immune system is a little different in how it responds to various things we put in front of it. Sometimes we can get very lucky and nearly everyone responds as expected. But more often than not, there’s some percentage of the population that just doesn’t react to the vaccine. Same can happen with pathogens too. The reason HIV is so good at killing us is that parts of our immune system simply ignore it most of the time. Same with cancer: most cancers get crushed by the immune system. Sometimes your immune system doesn’t respond and the cancer crushes you.