Table 3. SARS-CoV, OC43, and 229E neutralization test results for the four SARS cases in Guangdong Province, China^a.

Patient	No. daysb	SARS-CoV			OC43c	229Ec
		B	C	D	D	D
1 (onset 12/16/2003)	6	16	10	20	20	<20
	12	64	160
	22			160	20	<20
2 (onset 12/26/2003)	6	<8	40
	8			160	20	<20
	17	16	160
	21			160	20	<20
3 (onset 12/30/2003)	9			160	40	<20
	10		80
	13	32	160
	17			160	40	<20
4 (onset 1/8/2004)	8		<10
	15			80	20	<20
	18		20
	21			80	20	<20

^aSARS-CoV, severe acute respiratory syndrome–associated coronavirus. When no values appear, the test was not performed.
^bNumber of days the specimen was collected after symptom onset.
^cOC43 and 229E neutralization tests were conducted by laboratory D only.