Debates among Democratic presidential hopefuls in this recent cycle have been raucous, knock-down drag-em-outs. The next one is likely to be a more staid affair.

CNN will move its planned coverage of the next Democratic debate to a studio in Washington D.C from a hall in Arizona, a nod to concerns about the growing spread of coronavirus. Meanwhile, one of the journalists scheduled to moderate the event, Univision journalist Jorge Ramos, will bow out, citing medical concerns.

“Out of an abundance of caution and in order to reduce cross-country travel, all parties have decided that the best path forward is to hold Sunday’s debate at CNN’s studio in Washington, D.C., with no live audience,” the DNC said in a statement Thursday.

“The DNC, CNN and Univision recently learned that Univision anchor and moderator Jorge Ramos was in proximity with someone who was in direct contact with...