[ColanR]

Yes, it was. But they'd be very happy for you to forget that.

https://www.cnn.com/2021/03/31/health/pfizer-vaccine-adolesc...

https://www.webmd.com/vaccines/covid-19-vaccine/news/2021112...

https://www.cnbc.com/2021/05/25/covid-vaccine-moderna-says-s...

[latchkey]

All three of your links show a lack of understanding of the word 'efficacy', which is defined as: "the ability to produce a desired or intended result".

If you have a clinical trial and everyone in the trial passes the clinical trial, that doesn't mean the vaccine is a magic cape that protects 100% against the virus.

It just means that the desired result in the trial was achieved.

[ColanR]

If these were internal memos among domain experts, then understanding the nuances between "100% effective" and "immune" would be expected. But when the vaccine is being sold to the general population as "100% effective" I think we're just talking about wordplay.

Those articles made some pretty strong claims, and I'm not really sure what else a layperson is expected to take away from this besides "100% I won't get covid".

> Covid-19 vaccine is 100% effective

> Researchers observed 18 Covid-19 cases among the 1,129 participants who were given a placebo, and none among the 1,131 volunteers who got the vaccine.

> Pfizer COVID Vaccine Is 100% Effective in Adolescents

> A two-dose series was 100% effective against COVID-19, which was measured between 7 days and 4 months after the second dose.