乔·拜登总统的新冠肺炎病毒检测呈阳性已经四天了反弹感染白宫医生凯文·奥康纳博士周三报道。

奥康纳说，拜登“继续感觉良好”，并指出测试是在总统完成轻度锻炼后进行的。

“他仍然偶尔咳嗽，但没有昨天那么频繁了。他仍然没有发烧，精神状态良好，”奥康纳写道。拜登的体温、脉搏、血压、呼吸频率和氧饱和度也保持正常。

奥康纳周三表示，拜登将继续遵循严格的隔离措施，但不清楚他是否会超出疾病控制和预防中心提出的建议——正如白宫在他第一次检测呈阳性时发誓要做的那样。

拜登最初于7月21日检测出病毒呈阳性，并在完成五天的Paxlovid疗程后脱离隔离，检测结果为阴性。但在7月30日，他的测试再次呈阳性，奥康纳称之为“反弹阳性”——指的是一些患者在接受抗病毒治疗后出现的新冠肺炎复发。

白宫在拜登初步诊断后表示，只有在抗原测试呈阴性后，他才会结束隔离。疾病预防控制中心建议，如果一个人不发烧，症状有所改善，五天后停止隔离。它并不建议在阳性病例出现后90天内进行检测，除非出现新的症状。

对于拜登的反弹情况，白宫表示，总统将再次隔离整整五天，但没有说他是否会在测试呈阴性后才结束隔离。

白宫新闻秘书郭佳欣·让-皮埃尔周三告诉美国广播公司新闻的本·基特森，她不能说是否会是这样。

她说:“我必须核实一下疾病预防控制中心的指导到底是什么，但我们将遵循疾病预防控制中心的指导。”

当被问及白宫是否希望疾病预防控制中心敦促美国人也进行测试以结束隔离时，以及他们是否希望公众将总统的行为作为榜样时，让-皮埃尔说他们将“把它留给专家”

“这是专家的事，他们会跟踪这方面的科学变化，”她说。“你知道，这是COVID，我们知道，一代一次的疫情，所以我们让他们来做决定。”

周四将标志着拜登在第二次检测呈阳性后被隔离的第五天。

Biden is still testing positive for COVID. How long will he isolate?

President Joe Biden is still testing positive for COVID-19 four days into hisrebound infection, White House physician Dr. Kevin O'Connor reported Wednesday.

Biden "continues to feel well," O'Connor said, noting the exam was conducted after the president completed a light workout.

"He is still experiencing an occasional cough, but less frequently than yesterday. He remains fever-free and in good spirits," O'Connor wrote. Biden's temperature, pulse, blood pressure, respiratory rate and oxygen saturation also remain normal.

O'Connor said Wednesday that Biden will continue to follow strict isolation measures, but it's not clear if he will go beyond the recommendations laid out by the Centers for Disease Control and Prevention -- as the White House vowed to do the first time he tested positive.

Biden initially tested positive for the virus on July 21, and emerged from isolation after completing a five-day course of Paxlovid and testing negative. But on July 30 he tested positive again in what O'Connor called "rebound positivity" -- referring to a relapse of COVID-19 some patients experience after taking the antiviral treatment.

The White House said after Biden's initial diagnosis that he would end isolation only after testing negative on an antigen test. The CDC recommends that an individual stop isolating after five days if they are fever-free and symptoms are improving. It doesn't suggest testing within 90 days of a positive case unless new symptoms develop.

For Biden's rebound case, the White House has said the president would again isolate for five full days, but it hasn't said if he would end isolation only after testing negative.

White House press secretary Karine Jean-Pierre told ABC News' Ben Gittleson on Wednesday she couldn't say if that would be the case.

"I would have to check to see exactly what the CDC guidance is, but we are gonna follow CDC guidance," she said.

When asked if the White House wants the CDC to urge Americans to test to end isolation, too -- and if they want the public to use the president's behavior as a model -- Jean-Pierre said they'll "leave it to the experts."

"That is for the experts and they follow the science which changes on this," she said. "You know, this is COVID, as we know, once-in-a-generation pandemic, so we leave it to them to make that decision."

Thursday will mark Biden's fifth day of isolation after testing positive the second time.