September 22, 2022
JAMA Network Open
Public Health Ontario and University of Toronto
“Results: … receipt of 2 doses of COVID-19 vaccines was not protective against Omicron infection at any point in time, and VE [vaccine effectiveness] was –38% (95%CI, –61%, –18%) 120-179 days and –42% (95%CI, –69%, –19%) 180-239 days after the second dose. VE against Omicron was 37% (95%CI, 19-50%) ≥7 days after receiving an mRNA vaccine for the third dose.
Findings were consistent for any combination of 2 mRNA vaccines and 2 doses of BNT162b2 for the primary series.”
This is an open access article distributed under the terms of the CC-BY License. © 2022 Buchan SA et al. JAMA Network Open.
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breakthrough cases,COVID-19,vaccines