Once again, this is simply not true and has never been.
Here's a homework for you: Look up the efficacy figures in the information sheet of any standard vaccine. And then think about why many vaccines are given in multiple doses spread over a certain period of time.
Here's a homework for you: Look up the efficacy figures in the information sheet of any standard vaccine. And then think about why many vaccines are given in multiple doses spread over a certain period of time.