"With voluntary adoption, only a subset of the population will agree to download the app, keep the app running, and/or share the data with the health officials. Non-adopters cannot be notified, tested, or isolated if they have been [exposed to the virus]" https://tinyurl.com/ucso5vs 

"Nor can adopters be notified, tested, or isolated after contact with a non-adopter who tests positive—protecting non-adopters’ autonomy thus inevitably hinders others’ autonomy because they lack the information to make decisions to protect their health and the health of others"

"To some extent, such gaps could be plugged with manual contract tracing, but, as already noted, manual contract tracing is less effective and more intrusive than privacy-preserving digital contact tracing."

#COVID19 #privacy #ethics #publichealth