Why some researchers think the omicron variant could be the most infectious one yet

A man receives a dose of a COVID-19 vaccine in Soweto, Johannesburg, South Africa, on Monday. The omicron variant, first identified in South Africa, has now spread to at least a dozen other countries.

Preliminary data about omicron suggests the variant became widespread across southern Africa in a very short period of time. Scientists say its many mutations may play a role in its transmissibility.

(Image credit: Denis Farrell/AP)

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