IstanbulOn a sticky summer morning, the air thick with haze, Seher Odabaşı starts her work day in her office with the windows open. She turns on her computer and studies the screen, which displays row after row of names. Today’s chart contains about 50 cases, nearly 10 times as many as there were a couple months ago.

For Odabaşı, the list fills her with anticipation and uncertainty about what the day will bring because she must track down these people who are scattered throughout their neighborhood. It’s her job to keep COVID-19 from spreading.

As she heads out into the thrumming streets in the city’s Kadıköy District, Odabaşı scans the names on her electronic tablet, the connections, and the addresses. Before each