how do covid-19 vaccines work?

vaccination

References

REF 1

The Lancet

REF 2

Effectiveness of the BNT162b2 Covid-19 Vaccine against the B.1.1.7 and B.1.351 Variants

REF 3

Public Health England: COVID-19 vaccine surveillance report Week 28

REF 4

Communiqué de presse (Pfizer et BioNTech)

REF 5

Government
of Canada

REF 6

Comité sur l’immunisation du Québec