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K.J. Seung is surprised to be hiring and training new workers in Boston.

His public health nonprofit, Partners in Health, specializes in helping the poorest people in developing nations — tracking down contacts of Ebola patients in Liberia and Sierra Leone; running child health and HIV clinics in Haiti; and operating tuberculosis control programs in Peru. But now it is advertising for 500 people to help do what’s known as contact tracing to try to control Covid-19 in Massachusetts.

Image: Riders on the New York City subway last week wear personal protective equipment. JOHN MINCHILLO/AP