A collection of resources on Covid-19 vaccines, including frequently asked questions, continuing medical education, published research, and commentary.


To realize the potential of recently developed Covid-19 vaccines, clinicians must work effectively with patients and communities to administer them widely. The NEJM Vaccine Resource Center helps busy clinicians with practical information and advice.

Frequently Asked Questions

Paul E. Sax, M.D.

Paul Sax, M.D., a Professor of Medicine at Harvard Medical School and an infectious disease specialist, provides concise and engaging answers to clinicians’ questions about Covid-19 vaccination. Take a look below for his answers regarding the two mRNA Covid-19 vaccines and the adenovirus-vectored vaccine authorized in the United States. Disclosures.

Questions clinicians might have:

Vaccines — Mechanism, Efficacy, Safety

More Frequently Asked Questions ?

Recently Published Vaccine Research and Review

More Covid-19 Vaccine Research and Review