Pfizer followed 18000 jabbed people and placebo controlled group and said their own Jab didn’t work in Dec 2020
please see
Safety and Efficacy of the BNT162b2 mRNA Covid-19 Vaccine
Fernando P. Polack, M.D., Stephen J. Thomas, M.D., Nicholas Kitchin, M.D., Judith Absalon, M.D., Alejandra Gurtman, M.D., Stephen Lockhart, D.M.
John L. Perez, M.D., Gonzalo Pérez Marc, M.D., Edson D. Moreira, M.D., Cristiano Zerbini, M.D., Ruth Bailey, B.Sc., Kena A. Swanson, Ph.D., et al.
for the C4591001 Clinical Trial Group*
December 31, 2020
N Engl | Med 2020; 383:2603-2615