Maybe good to read this study as well: https://khub.net/documents/135939561/390853656/Effectiveness+of+BNT162b2+%28Comirnaty%2C+Pfizer-BioNTech%29+COVID-19+booster+vaccine+against+covid-19+related+symptoms+in+England.docx/a366af4e-9c7f-ce86-bc58-1cb3b88e3378