Dear all. I am writing about the merits, dangers and effectiveness of phone-based contact tracing this week. if you know something about one or more dimensions of this issue please get in touch. particularly interested in experts on digital signals as a proxy for infection

DM is fine, or email my handle with "son" at the end @ http://economist.com"> http://economist.com 

RTs very welcome, or intros to "people who know some people"