See the answer in this video by Dr. Chana Davis from Fueled by Science .
DP Links:
Do the COVID-19 vaccines reduce transmission?
References:
Pfizer Vaccine Efficacy (Ages 5-11). Vaccines and Related Biological Products Advisory Committee October 26, 2021 Meeting Document (See Page 61 Section 3.10.2. Dose 1 All-Available Efficacy Population – Phase 2/3)
Effect of Vaccination on Household Transmission of SARS-CoV-2 in England