News Release

Estimated effectiveness of COVID-19 vaccines against Omicron or Delta infection, outcomes

JAMA Network Open

Peer-Reviewed Publication

JAMA Network

About The Study: This study estimated the effectiveness of COVID-19 vaccines against symptomatic infections due to the Delta and Omicron variants and severe outcomes (hospitalization or death) associated with these infections among adults in Ontario, Canada.

Authors: Jeffrey C. Kwong, M.D., of Public Health Ontario in Toronto, is the corresponding author.

To access the embargoed study: Visit our For The Media website at this link 


Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.

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About JAMA Network Open: JAMA Network Open is the new online-only open access general medical journal from the JAMA Network. On weekdays, the journal publishes peer-reviewed clinical research and commentary in more than 40 medical and health subject areas. Every article is free online from the day of publication.

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