It's not 95% effective, though. > vaccine efficacy studies set a clear definition of “effective”. Those definitions changed after it became clear that the ori

It's not 95% effective, though. > vaccine efficacy studies set a clear definition of “effective”. Those definitions changed after it became clear that the original definitions -- those on the basis of which the vaccines were authorized, and people pressured into obtaining them -- were not met. If anyone had unrealistic expectations, it was policy-makers.