Ethics approval
All human studies have been approved by the appropriate ethics committee
and have therefore been performed in accordance with the ethical
standards laid down in the 1964 Declaration of Helsinki and its later
amendments. The analysis of the cases was approved by the Duke
University Health System Institutional Review Board under the Analysis
of possible COVID-19 re-infection protocol (Pro00107410) and the
Molecular and Epidemiological Study of Suspected Infection protocol
(MESSI, Pro00100241).