A week later, however, Admiral Giroir cracked down on Nevada’s “illegal” prohibition on BD’s and Quidel’s tests, which he said had imperiled the residents and staff of nursing homes across the state. “They cannot supersede the PREP Act,” he said.
The false positives that had emerged, Admiral Giroir said, were not only expected but “actually an outstanding result.” No test is perfect, he said.
In the Nevada statement, Dr. Azzam reaffirmed his concerns with the number of false positives that had arisen. “If this laboratory data discrepancy had been reported to Dr. Giroir, we would hope he would have taken the same action as Nevada,” he said. “We too want more testing with rapid turnaround in Nevada, but the results of those tests must be accurate, as they affect clinical care.”
The state’s nursing facilities can resume use of BD’s and Quidel’s products, according to a new Nevada directive issued on Oct. 9. But Nevada’s department of health also recommended that all antigen test results, positive or negative, be confirmed by a laboratory test that relies on a slow but very accurate and reliable technique called polymerase chain reaction, or P.C.R. False negatives, officials noted, risk exposing healthy people in nursing homes to someone who is unknowingly contagious. False positives, on the other hand, could prompt the placement of a person who is well into a unit with sick people, also increasing the chance of infection.
“Both of these scenarios could result in causing harm to a population that we have collectively worked so hard to protect,” the directive said. State health officials, it said, would also continue to investigate the use of BD’s and Quidel’s products.
“We need to better understand the issue before encouraging mass use of such tools among our most vulnerable citizens,” Dr. Azzam said. “We