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2 New Types Of COVID-19 'Delta Plus' Variants Are Emerging In Western Canada, Doctors Warn

The strain "likely" came into Canada from the U.S. Midwest.

Two new types of the COVID-19 Delta Plus variant are emerging in western Canada, doctors warn.

The warning came during a physician town hall on November 4, when Dr. Jessica Minion, a medical microbiologist with the Saskatchewan Health Authority, told fellow doctors about two new strains of the Delta variant - called AY.25 and AY.27.

Dr. Minion said: "This strain likely emerged in the U.S., in the Midwest, but then once it came to Canada it was noticeably different and quite separate.

"When we say Canada we mean Western Canada. We warned people that uncontrolled spread is going to lead to evolution of the virus. You give it enough opportunities to pass through enough people you're going to get something unique to western Canada and this is what it is."

New strains of the Delta variant around the world are being called AY and then a number which refers to the geographic location where they first emerged. For instance, AY.4 refers to a new strain of the Delta variant in the U.K., while AY.33.1 is expanding in the northeast U.S.

Dr. Minion's presentation explained that the volume of clades, or sub-lineages of these virus strains, had risen from a dozen in October to more than 100 a month later.

She also said that these new virus strains are only being found in B.C., Alberta and Saskatchewan.

Speaking about whether there was an added threat with these new strains of the virus, Dr. Minion said: "There is no evidence that any of these Delta Plus variants have increased severity over normal Delta, but it's difficult to measure that...because the demographics of who's getting infected has changed.

"The severity in vaccinated individuals is much less."