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What is the B.1.621 โ or mu โ variant?
B.1.621 is the latest variant of interest, according to the WHO, and was given the designation โ and a catchier Greek alphabet-based name, "mu" โ on August 30.
"The mu variant has a constellation of mutations that indicate potential properties of immune escape," reads the WHO's latest weekly epidemiological update.
That means those with some level of immunity to earlier strains, either by previous infection or vaccination, might be susceptible to infection from mu โ but that's only according to preliminary data and "needs to be confirmed by further studies," the update continued.
The variant was first detected in Colombia back in January, and since then, the country has experienced hundreds of cases and the variant has also been reported in 39 other countries around the world.
Here in Canada, it's barely making a splash: Mu cases have been reported for weeks, but so far, the variant hasn't made up more than three per cent of cases in any given week and recently totalled just 0.3 per cent โ though federal data since mid-July is still accumulating and could change.
What is the C.1.2 variant?
The variant C.1.2 isn't deemed a variant of interest or concern yet by the WHO, but researchers are pushing the organization to watch it closely.
A team of scientists from South Africa detected the new variant, which was first observed in May and has since spread to seven other countries in Africa, Europe, Asia and Oceania, according to a preprint study that hasn't yet been peer-reviewed.
"It's still not clear where this came from," noted Dr. Zain Chagla, an infectious diseases specialist with McMaster University in Hamilton. "It was first identified in South Africa but people need to know that South Africa has actually quite good sequencing networks and so it may not be the origin."
Richard Lessells, an infectious disease specialist and one of the authors of the research on C.1.2, told Reuters the variant may have even more immune-evasion properties than delta, based on its pattern of mutations, and that the findings had been flagged to the WHO.
However, it's not known yet if the variant is actually more contagious, or more capable of evading the immunity provided by either vaccines or a prior coronavirus infection.
"These things need time to see," Chagla said. "Delta is incredibly fit, and incredibly virulent and replaces [other strains] aggressively. We still haven't seen suggestions of this yet [with C.1.2]."