The California Senator and her husband underwent Covid-19 tests and the couple was declared negative. She has tested negative.
The campaign said the two people traveled with Harris on October 8 and then attended personal events.
At a rally in Greenville, North Carolina, on Thursday, Trump extended his "best wishes" to Harris, before adding, inaccurately, "which is more than they did to me, but that's ok". However, the campaign canceled all travel through Thursday after Harris' communications director - as well as a non-staff flight crew member - tested positive for coronavirus.
The statement said the person who tested positive was an "administrative member" of the company that charters Biden's 737 aircraft but was in the last row of the plane and "did not even have passing contact" with the former Vice President.
According to Democratic presidential candidate Joe Biden's campaign manager Jen O'Malley Dillon, "Senator Harris was not in close contact, as defined by the CDC, with either of these individuals during the two days prior to their positive tests; as such, there is no requirement for quarantine".
Coronavirus Vaccine Trials Stopped After Subject Suffers "Unexplained Illness"
The pause allows the company to determine whether the illness is related to the COVID-19 vaccine and whether to resume the study. The coronavirus vaccine research will test how protects a range of people. "This is likely to be a neurological event", he said.
Taking to Twitter on Thursday, Biden said: "Not only was the individual 50+ feet away and wearing a mask, but I was wearing an N-95 mask".
The Biden campaign's immediate disclosure of the positive results was in stark contrast with how Trump's campaign and White House have handled positive coronavirus tests from Trump himself as well as top campaign officials and aides.
The campaign has begun the contact tracing process to notify everyone who came into contact with the people during the time they may have been infected. All of his COVID tests have been negative as well and he will return to in-person campaigning on Friday.
Harris laughed when she acknowledged that Trump makes fun of the Biden campaign for wearing masks. And so we're working it out.