Table 3. SARS-CoV antibodies as determined by enzyme-linked immunosorbent assay in seven confirmed SARS case-patients, by number of days after illness onset, United States, 2003^a.

Case-patient	Days after illness onset	SARS-CoV antibodiesb
Patient 1
	6	Negative
	34	1,600
Patient 2
	4	Negative
	28	6,400
	64	6,400
Patient 3
	6	Negative
	25	6,400
	46	1,600
	71	1,600
Patient 4
	2	Negative
	5	Negative
	13	Negative
	30	6,400
Patient 5
	14	Negative
	41	1,600
Patient 6
	10	1,600
	11	1,600
	15	6,400
	23	6,400
Patient 7
	11	400
	15	1,600
	18	6,400
	21	6,400
	6	1,600
	32	6,400

^aSARS-CoV, severe acute respiratory syndrome–associated coronavirus.
^bReciprocal of dilution.