US Democratic vice presidential nominee Kamala Harris will suspend her travel plans until Monday after two people associated with the campaign tested positive for coronavirus, the campaign announced in a statement on Thursday. 

Harris was supposed to attend events in North Carolina on Thursday to encourage voters to cast early ballots.

However, the campaign told reporters on Thursday morning that Harris' communications director, Liz Allen, and a traveling staff member who had accompanied Harris to Arizona, had both tested positive.

Campaign manager Jen O'Malley Dillon said Harris did not need to quarantine, but "out of an abundance of caution" would cancel her travel plans before hitting the road again on October 19.

According to the campaign, Harris was last tested on Wednesday, and was negative.

A third person tied to Democratic candidate Joe Biden's campaign has tested positive for the coronavirus.

O'Malley Dillon said in a statement that a staffer for the company that charters the former vice president's campaign plane tested positive Thursday morning. The staffer was on the plane on Monday and Tuesday, but O'Malley Dillon said the staffer was always more than 50 feet (15 meters) away from Biden, and both Biden and the staffer wore masks for the entire flight.

Read more: Kamala Harris and Mike Pence spar over COVID-19 and economy

Biden campaign coronavirus scare

Joe Biden, the Democratic nominee challenging President Donald Trump, reportedly had no exposure, although he and Harris spent several hours campaigning together in Arizona on October 8.

"Neither of these people have had contact with Vice President Biden, Senator Harris or any other staffers since testing positive or in the 48 hours prior to their positive test results," O'Malley Dillon said in the statement, adding that Harris was not in what the US Centers for Disease Control and Prevention define as close contact with either person.

In Arizona, Harris and Biden spent hours campaigning together, making a number of campaign stops. They also attended a string of private meetings and made a joint appearance in front of reporters at an airport.

The pair remained masked at all times, both in public and in private, and have each had multiple negative tests since then, according to aides. 

O'Malley Dillon said the Biden campaign has begun the process of contact tracing "to notify everyone who came into contact with the individuals during the potential infection window."

Biden is scheduled to attend an ABC News town hall airing live at 8:00 p.m. EST on Thursday (0000 GMT Friday). The town hall comes after a second televised debate between Biden and Trump was cancelled due to the president and numerous White House staffers contracting COVID-19.

mvb/rs (Reuters, AP, AFP)