https://www.theguardian.com/world/2020/nov/09/what-has-pfizers-covid-vaccine-trial-found-and-is-this-a-breakthrough
How excited should we be?
Most experts agree that the results are exciting and excellent news, but the optimism should come with a note of caution: the results are preliminary, have been shared only by press release, and the trials are not yet complete.
So far, 38,955 people have received two doses of the vaccine, and the team plan a further analysis of the results once a total of 164 confirmed Covid-19 cases have occurred among the participants. They will also follow participants for two years post-vaccination to explore long-term safety and whether it continues to provide protection.