Joseph R. Biden Jr. is drastically modifying his campaign schedule in the coming days in response to mounting anxieties about the coronavirus, trading traditional get-out-the-vote-style gatherings for “virtual events,” his campaign announced Wednesday.

The move marked the beginning of an extraordinary new chapter in an already tumultuous presidential race: campaigning amid a pandemic.

Mr. Biden’s campaign had previously canceled an event slated for Thursday in Tampa, Fla., as well as a Cleveland rally on Tuesday night. Now, a Friday event in Chicago and a Monday stop in Miami will be turned into “virtual events,” the former vice president’s team said in a statement, hours after rolling out a “Public Health Advisory Committee” to guide the campaign that included several prominent former Obama administration officials.

“We have been and will continue to consult with relevant officials, including our recently announced Public Health Advisory Committee, regarding steps the campaign should take to minimize health risks for staff and supporters,” the statement said. “As a result of those conversations and at the request of elected officials in Illinois and Florida, we will no longer hold large crowd events on Friday and Monday in those states.”