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.](https://media.npr.org/assets/img/2021/11/29/south-africa-omicron-spread-1_wide-766470dc4a15dee538d26f0e93cd649df40a65f1.jpg?s=600)
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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