"The effectiveness of vaccines is far higher if everyone who can be vaccinated is, as the protective effect is multiplicative." That appears to be a talking po

"The effectiveness of vaccines is far higher if everyone who can be vaccinated is, as the protective effect is multiplicative." That appears to be a talking point that was just invented on the spot. No, vaccines don't have any kind of multiplicative effect. How would that work? That isn't what herd immunity means (or are we still not supposed to talk about that concept? I can't keep track). Herd immunity doesn't change the effectiveness of the vaccine for those who took it, it's only meant to be of benefit to people who don't (can't/won't) take it. Especially there cannot be any such effect from a 100% leaky vaccines that have already entirely stopped protecting people against infection - see the UK stats for proof.