Table 1.

Characteristics of plasma sample cohorts

Panel	Sample cohort	Country	Date of sample collection	N	Testing location
1	Suspected COVID-19 positive patients	The United States	April–May 2020	7	The United States
2	Healthy donors	The United States	2011	11	The United States and Nigeria
3	Healthy donors	The United States	October 2018–November 2019	98	The United States
3	Suspected COVID-19 positive patients	The United States	March–June 2020	106	The United States
4	COVID-19 confirmed positive patients	The United States	April–July 2020	108	The United States and Nigeria
5	Healthy donors	The United States	Prior to 2019	86	The United States

Suspected COVID-19 positive patient cohorts included donors that tested positive for SARS-CoV-2 by rRT-PCR (real-time reverse transcription polymerase chain reaction) and donors that had clinical signs/symptoms consistent with COVID-19 and household members testing SARS-CoV-2 positive. Healthy donor cohorts included samples collected prior to the beginning of the COVID-19 pandemic.