The President's diagnosis calls for contact tracing on a massive scale. Luckily, not everyone President Trump saw this week with is a high risk exposure. Here's who is.
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Selena Simmons-Duffin reports on health policy for NPR.
Carmel Wroth is a senior health editor for NPR's Science Desk, where she guides digital strategy for the health team and conceives and edits digital-first, enterprise stories and packages.