Table 31-1.

Annual Isolation Rates of Respiratory Viruses, Tecumseh, Michigan, 1976-1981

Numerator	Annual Isolation Rate, Adjusted by Proportion of Illnesses Sampled. By age group		Percentage Isolated	Annual Number of Attributable Illnesses	Percentage of Illnesses Resulting in Consultation
Denominator	100 Person-years		All Respiratory Illnesses	10,000 Population	Illnesses Attributable to Specific Agent
			All ages: children and adults
Age group	0-4 yr	5-19 yr	%	n	%
Rhinoviruses	59.6	13.2	54	8325	17.6
Coronaviruses			14	3428	17.6
Influenza viruses	14.6	30.4	9	2204	37.9
Parainfluenza viruses	28.3	7.5	4	979	26.2
Respiratory syncytial viruses	29.3	3.7	4	979	55.6
Adenoviruses	16.6	3.4	2	490	43.2
Other viruses	4.8	2.7	2	490	27.8
Bacterial			8	1959	48.6
Unknown and/or noninfectious			23	5650	21.5
Total or average	154.3	61.1	100	24,484	25.4

Adapted from Monto AS: Epidemiology of viral respiratory infections. Am J Med, 2002 Apr 22;112 Suppl 6A:4S-12S.