Table 3. Characteristics and Antibody Titer of Convalescent Plasma Donors.

	Donorsa
	1	2	3	4	5
Blood type	B	B	B	A	B
Donated plasma volume, mL	400	400	400	400	400
Interval between symptom onset and discharge, d	11	11	13	13	11
Interval between discharge and plasma donation, d	11	11	13	11	12
RBD-specific IgG ELISA titerb	16 200	1800	1800	5400	16 200
RBD-specific IgM ELISA titerc	16 200	1800	5400	5400	5400
Neutralizing antibody titerd	240	80	120	240	480

Abbreviation: RBD, receptor binding domain.

^aDonors-patients were matched by number (donor 1 gave plasma to patient 1, etc).

^bELISA end point dilution titers (IgG antibody). The expected titer of negative control from a healthy person is ≤200.

^cELISA end point dilution titers (IgM antibody). The expected titer of negative control from a healthy person is ≤200.

^dNeutralization end point dilution titers. The expected titer of negative control from a healthy person is ≤10.