Why was President Trump hospitalized at Walter Reed Medical Center?

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The White House says President Trump is exhibiting mild coronavirus symptoms so why was he admitted to Walter Reed National Military Medical Center? NBC News medical contributor Dr. Natalie Azar says, “What we know, unfortunately, about this disease is that while patients may exhibit mild symptoms early on in their course, it’s not really until the second week and after where, if a patient may clinical deteriorate, that can happen … We know that this can be a very sneaky virus and you’re not out of the woods if you’re in the first week or so of your illness.”