Covid-19 vaccine candidate is unimpressive: NNTV (number needed to vaccinate) is around 256

Pfizer’s vaccine “may be more than 90% effective.” (Mahase, BMJ 2020;371:m4347, November 9) Specific data are not given but it is easy enough to approximate the numbers involved, based on the 94 cases in a trial that has enrolled about 40,000 subjects

https://www.bmj.com/content/371/bmj.m4347/rr-4?fbclid=IwAR16ZXSRBnTPvS65FKvHUSwRQPfKVEKjR8eHNrb8W4r2lifJlaplseuXVfU