Contact-Tracing Apps Help Reduce COVID Infections, Data Suggest

Royalty Free Photo

Since the beginning of the COVID-19 pandemic, dozens of countries have deployed digital apps attempting to identify people exposed to the SARS-CoV-2 coronavirus and stop onward transmission. Evidence that these ‘contact tracing’ apps work has been hard to come by. Now, studies from a handful of nations show mounting evidence that apps can help prevent infections and are a valuable public-health tool. One way apps could improve is in how they measure exposure risk, says Dr. Joanna Masel, an evolutionary biologist at the University of Arizona, who is leading a pilot study of the COVID Watch app at the university.