跟據下麵文章和白宮醫生的表述，很可能川普總統周三做了新冠"抗原檢驗"，陽性，然後做了PCR檢驗，結果在周四晚上出來，陽性。所以白宮醫生說周四晚上"confirmed " 新冠陽性的診斷，但他沒有說最初陽性的診斷是何時和何種方法做出的。從他後來否認的在周六上午說的"診斷72小時後"來看，最初的陽性診斷可能是周三中午左右通過抗原檢測做出的。
看錄像並對比其他消息來源，我對白宮醫生說話的透明度和可信度沒有信心。
https://khn.org/news/white-house-testing-regimen-did-not-protect-the-president/
The White House said the president’s diagnosis was confirmed with a PCR test but declined to say which test delivered his initial result. The White House has been using a new antigen test from Abbott Laboratories to screen its staff for COVID-19, according to two administration officials.
The test, known as BinaxNOW, received an emergency use authorization from the Food and Drug Administration in August. It produces results in 15 minutes. Yet little is independently known about how effective it is. According to the company, the test is 97% accurate in detecting positives and 98.5% accurate in identifying those without disease. Abbott’s stated performance of its antigen test was based on examining people within seven days of COVID symptoms appearing.
