tracing

Imagine you begin to feel ill on Thursday, a few days after returning from a trip. You’re afraid it’s COVID-19, so you get tested on Friday. Even under good circumstances, it will probably be at least Monday before a contact tracer calls from the health department. And then some phone tag may ensue before you speak with anyone – if you get a call at all. Once a contact tracer does reach you, you will be asked to remember all the people you were in close contact with, starting two days before you began feeling symptoms. That means recalling all the places you went and the people you saw over the past week. It isn’t easy. As time passes, memories fade. Unfortunately, your contacts, unaware they were exposed to the coronavirus, may have already infected others. Concerned about those delays...

Two public health measures – testing, to identify those infected, and contact tracing, to identify those who may have encountered an infected person – have become essential as countries around the world reopen their economies and fresh surges of COVID-19 infections appear. Even as testing ramps up, contact tracing with a wide enough net remains a daunting task. Contact tracing involves public health staff conducting interviews with infected people. Public health experts are calling for 180,000 more contact tracers, but progress on contact tracing has not been going well, according to Dr. Anthony Fauci, the head of the National Institute of Allergy and Infectious Diseases. Enter digital innovations that offer a tantalizing promise: to automate the laborious task of alerting people who hav...