Unvaccinated populations across the world could be responsible for the emergence of more variants of COVID-19, according to local doctors studying the virus. The Mu and Delta variants have made a presence in the Chicago area although Dr. Egon Ozer of Northwestern Medicine says the Delta variant accounts for most of the cases today. 'Most of the MU cases were earlier in the summer and have since been declining almost everywhere except for Columbia,' said Egon. 'With current conditions, Delta is much more infectious, much more easily transmitted and so it tends to outcompete every other variant out there.

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