TABLE 1—

Summary of studies investigating virus infections in exacerbations of asthma using modern molecular detection methods

Overall detection rate %	Proportion of exacerbations due to rhinoviruses %	Age of subjects	Setting	Reference
80–85	50	9–11 yrs	Community	Johnston [6]
83	71	2–16 yrs	Emergency room	Rakes [15]
80	47	2–14 yrs	Hospitalised	Freymuth [16]
78	46	7–11 yrs	Community	Chauhan [17]
86	83^#	7–16 yrs	Emergency room	Grissell [18]
70	83^#	Adults	Emergency room	Grissell [18]
76	11	Adults	Emergency room	Wark [8]
44	26	Adults	Community	Nicholson [7]