The highly contagious Omicron sub\u002Dvariant known as BA.2 is gaining a foothold in Canada just as provinces begin removing pandemic restrictions, according to newly released data.
The spread of BA.2, which is believed to be 1.4 times as contagious as the already highly transmissible original Omicron sub-variant, could complicate reopening plans now underway in most provinces.
Sarah Otto, a professor of evolutionary virology and mathematical modelling at the University of British Columbia, and a leading Canadian expert on BA.2, said its rise in Canada “does not necessarily mean a second major Omicron wave will happen, more likely we’ll see a prolonged peak or a shoulder in the Omicron wave.”
The study found that it transmits at 1.4 times the rate of BA.1, replicates more easily in nasal cells and that experiments in hamsters show it is more virulent than BA.1 Its virulence compared to the earlier sub-variant is not entirely understood, said Doug Manuel, a senior scientist at The Ottawa Hospital Research Institute and a member of Ontario’s Science Advisory Table, but he said there are no “red flags” suggesting it could be more virulent. Fully understanding its implications will take time, he said.
Ontario, where case counts have dropped steadily in the past month, could be “spared the worst” of the BA.2 wave, she said. That is largely because so many people were infected with the original sub-variant of Omicron and booster rates are high.
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