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Methods| Serial SARS-CoV-2 antibody levels were measured in patients, nurses, physicians, and staff in a freestanding outpatient 5-bed/3–isolation room pediatric hemodialysis unit at Riley Hospital for Children, Indianapolis, Indiana. Hemodialysis occurs during 2 shifts on Monday, Wednesday, and Friday. All patients had temperature and symptoms of COVID-19 screened before entry. Patients wore surgical masks at all times, as did health care workers, who also had temperatures checked before and after shifts.

One week before this study began (day 0; March 25, 2020), a single patient presented with fever and generalized symptoms. A reverse transcriptase–polymerase chain reaction (PCR) test result for SARS-CoV-2 on a nasopharyngeal swab was positive, and results on subsequent swabs remained positive on days 7 and 14 until day 19 (April 11, 2020). The patient was dialyzed in an isolation room on day 0 …