US virus tracking: a patchwork of apps, human tracers

Washington: Digital or manual? Bluetooth or GPS? Centralized or decentralized?

Efforts in the United States to track the spread of the deadly novel coronavirus — known as contact tracing — have become a patchwork based on differing approaches to technology and civil liberties.

Some US governors have shunned digital tracing efforts, instead hiring thousands of human contact tracers to locate people who have been near an infected individual.