The thing about vaccinations is whether you are thinking about the group or an individual. Individuals may get sick from a vaccination, but as a group WE are all better off if everyone gets the flu shot, the measles shot, whatever.
I take the flu shot every year. I haven't been sick in many years. I also wash my hands a lot when out in public, and I learned not to touch my face until I get home and can wash my hands. It makes a big difference.
Stay well, Stay happy!