Omicron, as the World Health Organization called the variant, swiftly overtook other forms of the virus. It remains dominant now, on its second anniversary.
In the two years since its emergence, Omicron has proved to be not only staggeringly infectious, but an evolutionary marvel, challenging many assumptions virologists had before the pandemic.
But researchers warn that the virus still has the capacity to surprise us, especially if we stop paying close attention.
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