At least 60 sitting members of Congress — more than one in 10 — have tested positive for the coronavirus or are believed to have had Covid-19 at some point since the pandemic began. The list includes 44 Republicans and 16 Democrats.

That’s a higher proportion than the general population. As of Wednesday, a bit fewer than one in 14 Americans are known to have had the virus, according to a New York Times database, though many more cases have probably gone undetected.

Five House members have reported positive tests since the attack on the Capitol last week, when many lawmakers were holed up in a secure location together and some refused to wear masks — a situation that angered several Democrats, including Representative Pramila Jayapal of Washington, one of those who has since tested positive. Congress’s attending physician warned members afterward that it was possible they were exposed while sheltering and recommended that they get tested.

Congress has struggled to stem the spread within its ranks in recent weeks. Most members who have tested positive have done so since the election in November, as coronavirus cases have surged across the country.

Representative Jake LaTurner, Republican of Kansas, said he received word just after the attack on the Capitol last Wednesday that he had tested positive, and did not return to the House floor for a vote early on Thursday.

Representative Gus Bilirakis of Florida and Representative Michelle Steel of California, both Republicans, were absent from the House floor when the mob entered the Capitol because each had received positive test results earlier that morning. Representative Chuck Fleischmann, Republican of Tennessee, said on Sunday that he had tested positive after exposure to Mr. Bilirakis, with whom he shares a residence.