The lab used by the NFL for COVID-19 tests said Monday that an isolated contamination caused 77 ”most likely false positive results.” In a statement, Bio Reference Laboratories said the test results on Saturday were contaminated during preparation at its lab in New Jersey. Eleven clubs were affected, and the tests were re-examined and found to be false positives. Among teams reporting false positives, the Minnesota Vikings said they had 12, the New York Jets 10 and the Chicago Bears nine.