When the Pfizer conducted there phase 3 trials , all that was measured was the amount of people in the control group who contracted a covid infection and the amount of people in the placebo group who contracted covid. As well as the amount of adverse reactions. This is something called " vaccine efficacy ".
The hypothesis was since very few people in the control group contracted covid , the viral loads in their mouths and throats would be low enough to not transmit the virus. Unfortunately the covid virus mutates faster than expected and it more contiguous than expected.
No drug company can purposely try and infect a human with a pathogen to test for transmissibility and vaccine effectiveness. That is some angel of death Nazi death camp stuff. Transmissibility rates are something that comes later with real world data. We are going to be learning about this virus for decades. It is called " Science ".
I swear I lose five IQ points every time I post here.
Dr. John Campbell is a snake pandering for youtube hits. His platforms earns him like 6000 a month. You don't get those hits with real science. You have to try and provide a more sensational. Grifters