(CNN) While President Donald Trump has spoken frequently about the coronavirus outbreak, first lady Melania Trump has kept a relatively low profile, which is different from how some former first ladies have handled past national crises.

Melania Trump tweeted Sunday evening, encouraging her followers to practice "social distancing" and follow guidelines from the Centers for Disease Control and Prevention. It was her first social media comment on the topic in four days.

She has not been seen in public since March 10, when she delivered remarks to a national conference of PTA leaders in Virginia — where she did not mention coronavirus — and later attended a Presidential Medal of Freedom ceremony at the White House.

The White House has not responded to requests for comment from CNN as to the health status of the first lady, any plan she has to address the nation about the virus crisis, and her exact whereabouts.

CNN has also requested comment about the status of the annual White House Easter Egg Roll, slated for April 13th, for which the first lady typically oversees the planning and organization. A March 18th campaign fundraiser in Beverly Hills, California, scheduled to be hosted by Trump, was canceled last week. The White House press secretary told CNN the move was due to "scheduling conflicts."

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