I was wondering, when will Covid-19 vaccines become the most widely used vaccine in history?
Apparently the BCG has been given to 4 billion people since it was approved in 1921. There have been 5.3 Billion Covid jabs so far, but it'll probably need to hit something like 8-9 Billion before it tops the BCG when you include the boosters for BCG, which is at the moment the most widely used vaccine in history (100 years this year!)
Technically there's over a dozen Covid-19 vaccines in use and to compare fairly we'd need to include all the other TB vaccines that have been used, but when you include boosters I'd expect TB vaccination to be disappearing into the rear view.