Canada: Ontario Risk Assessment for BA.2 to April 5, 2022

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“Close monitoring of epidemiological trends since March 21, 2022 (date of mask mandate removal) suggests a corresponding temporal association with a subsequent increase in confirmed COVID-19 cases, percent positivity, and hospitalizations.”

Ontario has released a new risk assessment for BA.2.

Key points:

    • BA.2 now more than 50% of sequences in Ontario
    • High viral load may play a role in increased transmissibility of BA.2
    • Due to increased transmissibility of BA.2, the absolute number of severe cases would be expected to increase
    • The number of children with severe disease is likely to increase
    • Masking with high-quality masks at a population level is a public health measure that can be effective at reducing transmission
    • Temporary re-implementation of masking requirements indoors and improved air quality can reduce the risk of in-school transmission
    • Among BA.2 cases from February 20, 2022 to March 19, 2022, the majority occurred in individuals who had completed their vaccination series, i.e. individuals who were post-booster dose (54.8%) or post-series completion (28.5%), followed by unvaccinated individuals (13.3%)
    • Between the week of March 13 to 19, 2022 and the week of March 20 to 26, 2022 the number of reported cases increased 32.1% among healthcare workers.






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Image by Pascal Weiland from Pixabay

** This post was originally published on April 9, 2022 **