“If the vaccines work, why are vaccinated people more likely to test positive?”
Recent raw data from Ontario makes it seem like the vaccines aren’t working. But as always, context matters.
Remember that:
a) Not everyone can get a test. Confirmed cases will tend to be those who are older, work in high-risk settings, and/or are more vulnerable. Those are all highly vaccinated populations.
b) The vaccines were rolled out to older and more vulnerable people first. So their immunity, which might have been lower to start with, will have waned more.
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We’ve had some questions about why the COVID-19 case rate appears higher for vaccinated people.
We breakdown some reasons why in this thread.
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— ScienceUpFirst | LaScienced’Abord (@ScienceUpFirst) March 23, 2022
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- COVID-19 vaccinations data
- Ontario Dashboard – Ontario COVID-19 Science Advisory Table
- Age-standardized Rates
- Canada is flying blind with Omicron as COVID-19 testing drops off a cliff | CBC News
- Updated Eligibility for PCR Testing and Case and Contact Management Guidance in Ontario | Ontario Newsroom).
- ICES COVID-19 Dashboard
- Immunological and clinical efficacy of COVID-19 vaccines in immunocompromised populations: a systematic review
- Ontario hospitals to keep mandatory COVID vaccination for staff, some for visitors | Globalnews.ca
- COVID-19 Vaccine Third Dose Recommendations
- Age-related immune response heterogeneity to SARS-CoV-2 vaccine BNT162b2 | Nature
- SARS-CoV-2 Omicron VOC Transmission in Danish Households | medRxiv
