A woman wearing a face mask to curb the spread of COVID-19 holds a child on her back on a crowded sidewalk in Pretoria, South Africa, Saturday, Nov. 27, 2021. As the world grapples with the emergence of the new variant of COVID-19, scientists in South Africa — where omicron was first identified — are scrambling to combat its spread across the country. (AP Photo/Denis Farrell)
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