Table 6.

Annual Isolation Rates of Respiratory Viruses, Tecumseh, Michigan, 1976–1981: Actual Rates per 1,000 Person-Years, and Rates per 100 Person-Years Adjusted by Proportion of Illnesses Sampled (in parentheses)

	Age Group (yr)
Agent	0–4 (539)∗	5–19 (1,541)∗	20–39 (1,523)∗	40+ (1,757)∗
Rhinoviruses	113.2 (59.6)†	25.3 (13.2)	38.7 (21.5)	9.7 (8.8)
Influenza A (H3N2)	16.7 (8.8)	10.4 (5.5)	5.9 (3.3)	6.8 (6.2)
Influenza A (H1N1)	7.4 (3.9)	26.6 (14.0)	2.0 (1.1)	0.0 (0)
Influenza type B	3.7 (1.9)	20.8 (10.9)	7.2 (4.0)	3.4 (3.1)
Parainfluenza viruses	53.8 (28.3)	14.3 (7.5)	3.9 (2.2)	2.3 (2.1)
Respiratory syncytial viruses	55.7 (29.3)	7.1 (3.7)	6.6 (3.7)	2.3 (2.1)
Adenoviruses	33.4 (16.6)	6.4 (3.4)	4.6 (2.6)	1.1 (1.0)
Other	9.2 (4.8)	5.2 (2.7)	2.0 (1.1)	1.1 (1.0)
Total	293.1 (154.3)	116.1 (61.1)	70.9 (39.4)	26.7 (24.3)

Reprinted with permission from Epidemiol Infect.8

^∗Number of person-years of observation.

^†Actual isolation rates per 1,000 (adjusted isolation rates per 100).