A worker fumigates a bus in Kenya’s Machakos county, where a third COVID wave is sweeping the area. The UN chief is warning the world that it must act now, or face a situation in which rich countries vaccinate the majority of their people and open their economies, while the virus continues to cause deep suffering by circling and mutating in the poorest countries.

First published in the May 25, 2021, 11:11 p.m. edition

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