WHO:
"[..] measles, which we know to be about 98% effective"
"Most routine childhood vaccines are effective for 85% to 95% of recipients"
https://www.who.int/vaccine_safety/initiative/detection/immu...
That's a very unscientific assumption. Vaccines regularly lose efficacy, which is why 85% for the 'best' is reasonable.
WHO:
"[..] measles, which we know to be about 98% effective"
"Most routine childhood vaccines are effective for 85% to 95% of recipients"
https://www.who.int/vaccine_safety/initiative/detection/immu...