TABLE 1.

Acute respiratory infections in Roberto del Rio Children's Hospital from 1989 to 2000

Yr	No. of outpatient visits for ALRIa	No. of hospitalized patients enrolled	No. of RSV-positive cases	% RSV positive
1989	23,728	270	105	39
1990	23,431	260	85	33
1991	19,974	502	95	19
1992	16,801	421	115	27
1993	16,451	315	124	39
1994	18,757	452	146	32
1995	19,679	448	82	18
1996	21,554	326	121	37
1997	20,943	337	92	27
1998	22,600	448	103	23
1999	20,395	450	125	27
2000	23,440	389	144	37
Total	247,753	4,618	1,337	29

^aChi square for linear trend: 0.01 (P = 0.978).