Josh Shapiro, the attorney general of Pennsylvania attorney who is running unopposed in the Democratic primary for governor, announced on Twitter early Tuesday that he had tested positive for the coronavirus. He was experiencing mild symptoms.

Mr. Shapiro, 48, wrote that he was isolating at home, but planned to be back on the campaign trail next week. He said he would kick off his general election campaign in the city of Johnstown, Pa., about 60 miles east of Pittsburgh.

“Please get out there and vote today — and after these few days at home, I’m going to go win this race for Pennsylvania,” Mr. Shapiro tweeted.

Last night, after taking a precautionary test before heading to Johnstown and Pittsburgh, I tested positive for COVID-19.

I’m experiencing some mild symptoms and will continue serving the people of Pennsylvania as I isolate at home.

— Josh Shapiro (@JoshShapiroPA) May 17, 2022

Mr. Shapiro is a graduate of Georgetown University Law Center who once worked as a legislative aide for Senator Robert Torricelli, a Democrat from New Jersey who is now retired from politics.

If he is elected governor, Mr. Shapiro has said, he would veto any new abortion bans that the Republican-dominated legislature were to pass if Roe v. Wade is overturned by the U.S. Supreme Court. The four Republicans vying for their party’s nomination for governor all support stricter abortion laws.