Exposure Notification just lets you know you were exposed. No other details are revealed to anyone else, including health authorities, so it is entirely up to t

Exposure Notification just lets you know you were exposed. No other details are revealed to anyone else, including health authorities, so it is entirely up to the judgment of the exposed if they should go for testing or to isolate. The presumption is if you feel fine you're likely to write the notification off as a false positive, or not be very proactive about seeking testing immediately (I'll go tomorrow after my important lunch meeting...I feel fine after all...) Contact tracing, in this context, means your identity is revealed to a health authority that can require you to be tested and isolated, even if you happen to feel fine. This is an invasion of privacy but it also may be able to reduce the number or severity of super spreader incidents.