[Brian Griffin]

“Two doses of inactivated polio vaccine (IPV) are 90% effective or more against polio; three doses are 99% to 100% effective.”

https://www.cdc.gov/vaccines/vpd/polio/hcp/effectiveness-duration-protection.html

One childhood vaccine[DTaP] is scheduled to be given five times.

Three childhood vaccines are scheduled to be given four times.

~10% immunization failure rate for two-dose polio vaccine
~6% immunization failure rate for two-dose Covid vaccine

[metmom]

One childhood vaccine[DTaP] is scheduled to be given five times.

Yeah, because giving a shot to a 2, 4, and 6 month old infant is so worth it.

Giving that number of injections to babies that little is criminal and we wouldn’t “need” 5 for actual immunity if they just waited a few months.