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Why does the Omicron sub-variant spread faster than the original?
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Why does the Omicron sub-variant spread faster than the original?

Ewen Callaway The Philippines is one of the nations in which the BA.2 sub-variant of Omicron has spread quickly. Credit: Lisa Marie David/Reuters COVID-19 researchers are rushing to understand why a relative of the main Omicron variant is displacing its sibling in countries around the world. The variant, known as BA.2, has spread rapidly in...