How everyday Americans have turned disease detectives — armed with a phone

It could be a chapter out of a science fiction book: Librarian becomes disease detective and tracks down deadly virus.

For 64-year-old Jensa Woo, she's used to being surrounded by stacks of dystopian novels. But now she's living it and writing her own story as a Covid-19 contact tracer ready to fight in the so-called "invisible war..." 

Full Article on CNN