JOHANNESBURG—South Africa’s sputtering Covid-19 vaccine rollout, hampered first by dose shortages and more recently public distrust, has left many of its 60 million people potentially exposed as the new Omicron variant spreads across the country.

In recent days, more people have turned out to get their shots amid warnings from scientists and the World Health Organization about Omicron, which has driven a sharp increase in Covid-19 infections in the country’s most populous province of Gauteng, home to Johannesburg, over the past two weeks.



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