Senator Kelly Loeffler of Georgia, a Republican who’s campaigning in a high-stakes runoff election that might decide management of the Senate, is isolating after receiving each a damaging and constructive check for the coronavirus on Friday after which receiving an inconclusive end result on Saturday, a marketing campaign spokesman stated.

Ms. Loeffler has worn masks whereas interacting with individuals, however was indoors and unmasked amongst unmasked crowds at an occasion on Thursday. She wore a masks whereas greeting voters who lined as much as meet her.

On Friday morning, she took two coronavirus checks, in keeping with her marketing campaign spokesman, Stephen Lawson.

A kind of was a fast check, which got here again damaging, and Ms. Loeffler “was cleared to attend” occasions on Friday, together with a rally with Vice President Mike Pence and Senator David Perdue of Georgia, Mr. Lawson stated. However the second check, a polymerase chain response, or P.C.R., check — which is taken into account extra correct — got here again with a constructive end result after her occasions on Friday night, he stated.

Ms. Loeffler, 49, acquired one other P.C.R. check on Saturday morning. Nevertheless it was “inconclusive,” Mr. Lawson stated of the outcomes, which got here in Saturday night.

The senator adopted C.D.C. tips by notifying these with whom she had had sustained contact whereas she awaits additional check outcomes, he stated.

“She has no signs and she’s going to proceed to comply with C.D.C. tips by quarantining till retesting is conclusive and an replace shall be offered at the moment,” Mr. Lawson stated in an announcement.

Ms. Loeffler has held latest occasions with outstanding Republicans, together with Mr. Pence, Senator Tom Cotton of Arkansas and Mr. Perdue, who can also be engaged in a runoff election that might decide management of the Senate. Mr. Perdue is remaining at residence till extra particulars are recognized concerning the well being standing of Ms. Loeffler.

“Senator Perdue will stay at residence till Senator Loeffler receives affirmation of her check outcomes,” wrote John Burke, a Perdue marketing campaign spokesman, in a textual content message Sunday.

The Loeffler marketing campaign didn’t present an replace on her standing Sunday morning. Mr. Perdue, 70, has encouraged individuals to put on masks to assist cease the unfold of the coronavirus. However he has additionally appeared at rallies the place individuals didn’t put on masks. A Friday tweet from Ms. Loeffler features a image that exhibits the 2 senators in an indoor setting with out masks.

A spokesman for Mr. Pence, Devin O’Malley, stated that “as he awaits a confirmatory check from Senator Loeffler, Vice President Pence is in common session with the White Home Medical Unit and shall be following C.D.C. tips as he has in different circumstances when he has been a detailed contact.”

The final time Mr. Pence was deemed a detailed contact was final month, when his chief of employees, Marc Quick, examined constructive.

Mr. Pence continued to marketing campaign then, with the White Home saying that he was performing “important” duties that exempted him from Facilities for Illness Management and Prevention tips calling for individuals to quarantine for 14 days after publicity to the virus.

Ms. Loeffler, a businesswoman who’s the Senate’s richest member, was quickly appointed to her Senate seat late final yr. She faces the Rev. Dr. Raphael G. Warnock, a Democrat, in an election on Jan. 5, when Georgia voters may also resolve between Mr. Perdue and his opponent, Jon Ossoff, a Democrat.