TABLE 2.

Etiologic agents in nasopharyngeal aspirates by age of patient

Age (yr) of patient	No. (%) of respiratory virusesf							Total no. of NAg
	RSV	RV	ADE	IFL	ENT	HSV	Negative
<1a	39 (21.2)	34 (18.5)	6 (3.3)	3 (1.6)	9 (4.9)	1 (0.5)	101 (54.9)	184
1-2b	15 (16.0)	15 (16.0)	6 (6.4)	2 (2.1)	3 (3.2)	0 (0)	56 (59.6)	94
2-3c	10 (14.9)	12 (17.9)	2 (3.0)	3 (4.5)	0 (0)	0 (0)	41 (61.2)	67
3-4d	7 (12.7)	14 (25.5)	2 (3.6)	2 (3.6)	1 (1.8)	2 (3.6)	28 (50.9)	55
4-10e	4 (4.8)	13 (15.5)	0 (0)	3 (3.6)	2 (2.4)	0 (0)	62 (73.8)	84
10-15	1 (4.0)	4 (16.0)	0 (0)	2 (8.0)	0 (0)	1 (4.0)	17 (68.0)	25
15-18	0 (0)	1 (12.5)	0 (0)	0 (0)	0 (0)	0 (0)	7 (87.5)	8
Total	76 (14.7)	93 (18.0)	16 (3.1)	15 (2.9)	15 (2.9)	4 (0.8)	329 (63.6)	517

^aMixed infections: six RV-RSV infections, one RV-ADE infection, one RV-HSV infection, and one RSV-echovirus 30 infection. Enteroviruses: echovirus 2 (n = 3), echovirus 30 (n = 3), echovirus 3 (n = 1), unknown (n = 1), poliovirus 2 Sabin (n = 1).

^bMixed infections: one RV-ADE infection. Enteroviruses: echovirus 2 (n = 2), unknown (n = 1).

^cMixed infections: one RV-RSV infection.

^dMixed infections: one RV-RSV infection. Enteroviruses: echovirus 5.

^eEnteroviruses: echovirus 2 (n = 2).

^fRSV, respiratory syncytial virus; RV, rhinovirus; ADE, adenovirus; IFL, influenza virus; ENT, enterovirus; HSV, herpes simplex virus.

^gNA, nasopharyngeal aspirate.