美国白宫总统医生凯文·奥康纳30日说，总统拜登当天新冠病毒检测结果再次呈阳性。
US President Joe Biden tested positive for COVID-19 on Saturday in a "rebound" case, days after ending isolation and treatment, according to his doctor.
奥康纳在一份致白宫的备忘录中说，拜登当天上午接受新冠病毒抗原检测，结果呈阳性。拜登没有再次出现感染症状、感觉良好，目前不用恢复治疗，但需要继续观察并重新进入隔离。
White House physician Dr. Kevin O'Connor wrote in a memo that Biden "has experienced no reemergence of symptoms, and continues to feel quite well" but will reinitiate strict isolation procedures.
Biden, 79, first tested positive for the coronavirus on July 21 before receiving negative testing results earlier this week.
Fully vaccinated and twice boosted, Biden took Paxlovid, an antiviral therapy produced by Pfizer and given to patients with COVID-19.
There is potential for so-called "rebound" COVID positivity observed in a small percentage of patients treated with Paxlovid, according to O'Connor.
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