No new cases of the Mu strain of COVID have been reported recently, something scientists worried about months ago when they flagged the mutation to keep an eye on it.
The strain was expected to be more transmissible than Delta, and was labeled by the WHO as a variant of interest.
As of now, there are no new cases, but if someone were to travel here with it then of course it could spread again.
Part of the reason it likely did not spread was due to the dominance of the Delta variant, which stopped the Alpha, Beta, and Gamma variants from ever having a chance.
The variants all compete for dominance and while the Delta has proven deadly, it’s also kept all other variants at bay.