/with-strong-data-on-two-covid-19-vaccin

Pfizer annonce maintenant que l’efficacité de son vaccin est de 95%...

Dr. Angela Rasmussen sur Twitter :

“Well, we still don’t know how this vaccine will perform in a very large population of people. Basing efficacy on 170 cases out of 44,000 participants means that we can’t say with certainty if efficacy will remain at 95% in the larger population .” / Twitter
▻https://twitter.com/angie_rasmussen/status/1329070736481259521

That doesn’t mean the trial is flawed or the data is unreliable. There are limitations to extrapolating data from 170 people to the larger, more diverse population of millions of people. I don’t expect efficacy to be substantially reduced at population scale, but it may change.

Also, it is still unclear what, if anything, has been done to look at viral loads in the vaccinated cases. This has important implications for transmission. If vaccinated people can get infected and are shedding lots of virus, they could potentially transmit to others.