Real-time polymerase chain reaction (RT-PCR) is used to rule out SARS-CoV-2 prior to surgery, however few studies have evaluated patients with negative testing after surgery. Some 499 patients with negative tests were followed for 14 days after surgery, 39 were retested but none developed positive RT-PCR after operation. The risk of developing a positive RT-PCR after surgery was 0.74 per cent.

中文翻译：

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大流行期间择期耳鼻喉科手术患者术前实时 SARS CoV-2 聚合酶链反应检测结果：一项前瞻性队列研究

实时聚合酶链反应 (RT-PCR) 用于在手术前排除 SARS-CoV-2，但很少有研究评估手术后检测结果呈阴性的患者。约 499 名检测呈阴性的患者在手术后随访了 14 天，其中 39 名患者进行了重新检测，但术后没有出现 RT-PCR 阳性。手术后 RT-PCR 呈阳性的风险为 0.74%。