Table 4. Characteristics of SARS case-patients, U.S. SARS surveillance, March 17–July 18, 2003^a.

Characteristic	Overall			SARS-CoV positive		SARS-CoV negative			SARS-CoV undetermined
	Probable, % (N = 72)	Suspect, % (N = 326)		Probable, % (N = 8)		Probable, % (N = 39)	Suspect, % (N = 167)		Probable, % (N = 25)	Suspect, % (N = 159)
Age (years)
0–4	15	14		0		15	10		20	19
5–9	4	4		0		3	5		8	4
10–17	3	2		0		5	2		0	0 (1)
18–64	58	73		100		54	76		52	70
>65	20	7		0		23	7		20	7
Sex
Female	44	47		50		41	50		48	45
Male	56	53		50		59	50		52	55
Race
White	47	58		37		54	62		40	53
Black	1	2		0		0	2		4	1
Asian	40	33		63		36	28		40	38
Other	2	0 (1)		0		2	0		0	2
Unknown	10	7		0		8	8		16	6
Exposure
Travel	83	81		88		87	82		84	81
Close contact	14	16		12b (1)		13	17		8	14
Health care worker	0	1		0		0	0		0	1
Unknown	3	2		0		0	1		8	4
Hospitalized
Yes	61	25		88		59	26		56	23
No	39	75		12 (1)		41	73		44	75
Unknown	0	1 (3)		0		0	1		0	2
Mechanically ventilated
Yes	3 (2)	1 (2)		12 (1)		0	1 (1)		4 (1)	1 (1)
No	89	93		88		97	95		80	91
Unknown	8	6		0		3	4		16	8

^aSARS-CoV, severe acute respiratory syndrome–associated coronavirus.
^bThis case-patient also traveled to Hong Kong and stayed at Hotel M; however, onset of illness was 13 days after returning to the United States.