All of it
what scientific journal you been reading to ascertain this?
Here you go loon.
COVID vaccines slash viral spread – but Delta is an unknown
Studies show that vaccines reduce the spread of SARS-CoV-2 by more than 80%, but the Delta variant is creating fresh uncertainty.
www.nature.com
Now go back in time and fight off polio with your "trust" in your immune system to "do its job".