Posted by pBlue > 2020-07-17 12:44 | Report Abuse

That is a good article, I hope more people read it. Phase I trials just tells if the vaccine is safe or not to take. Not that it works. Water would pass a PhaseI trial. And vaccine efficacy can fail in months, it is not automatically certain that immunity is long lasting or that it is granted to the everyone vaccinated. Even the vaccines that we use are not 100% efficient. For example the measles vaccine, a single dose is only 95% efficient, that is why we take a double dose to get 98%....better but 2% of people who take the vaccine are not immune. That 2% are kept safe by herd immunity.