跟据下面文章和白宫医生的表述，很可能川普总统周三做了新冠"抗原检验"，阳性，然后做了PCR检验，结果在周四晚上出来，阳性。所以白宫医生说周四晚上"confirmed " 新冠阳性的诊断，但他没有说最初阳性的诊断是何时和何种方法做出的。从他后来否认的在周六上午说的"诊断72小时后"来看，最初的阳性诊断可能是周三中午左右通过抗原检测做出的。
看录像并对比其他消息来源，我对白宫医生说话的透明度和可信度没有信心。
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.
