Harris disclosed the information in a series of tweets on Thursday.
The campaign announced two positive cases Thursday morning - Ms. Harris "communications director Liz Allen and an unnamed crew member on one of Ms. Harris" recent campaign trips.
"If anything, let this serve as an example of the importance of wearing masks and keeping a safe, social distance".
"Regardless, out of an abundance of caution and in line with our campaign's commitment to the highest levels of precaution, we are canceling Senator Harris's travel through Sunday, October 18th, but she will keep a robust and aggressive schedule of virtual campaign activities to reach voters all across the country during this time", Dillon said in the statement.
"This shows how seriously we take Covid, how we have since March done everything in our power as a campaign to ensure the safety of our staff and our volunteers and voters, and we'll continue to do so", campaign manager Jen O'Malley Dillon said on a call with reporters.
After canceling her Friday appearance following a staffer's positive test for coronavirus, Sen.
Joe Biden has flown on a plane with a crew member who later tested positive for Covid-19, his campaign has said.
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. They were 50 feet away from each other, and Biden and his team wore N95 masks, according to the campaign.