During a pandemic, contact tracing is an essential tool to drive down the infection rate within
a population. To accelerate the laborious manual contact tracing process, digital contact
tracing (DCT) tools can track contact events transparently and privately by using the sensing
and signaling capabilities of the ubiquitous cell phone. However, an effective DCT must not
only preserve user privacy but also augment the existing manual contact tracing process.
Indeed, not every member of a population may own a cell phone or have a DCT app …