The league asked the New Jersey lab BioReference to investigate the results, and those 77 tests are being re-tested once more to make sure they were false positives.
Among teams reporting false positives, the Minnesota Vikings said they had 12, the New York Jets 10 and the Chicago Bears nine.
The NFL uses BioReference for all of its COVID-19 testing, though tests are handled by labs throughout the nation to ensure teams get results quickly — hopefully within 24 hours. Heading into this weekend, there had been four confirmed positive tests for players who were at training camps.
“All have come back as negative, which is consistent with the irregularities across the league from multiple teams. As a result, we are reopening our building and will resume football activities this afternoon. As per protocol, the individuals with test results in question may not re-enter the building until they receive another negative test result tomorrow.”