Is Acute Exacerbation of COPD (AECOPD) Related to Viral Infection Associated with Subsequent Mortality or Exacerbation Rate?

Table 1.: Incidence rate ratio (IRR) of exacerbations during 1-year follow-up.

	IRR (95% CI)
Presence of virus at index exacerbation: Non viral index AECOPD	ref
Viral index AECOPD	0.57 (0.39-0.84)*
Number of exacerbations during the year preceding the index exacerbation: No AECOPD	ref
One AECOPD	2.12 (1.28- 3.50)
Two or more AECOPD	3.26 (2.09 – 5.06)

^* Adjusted for number of previous exacerbations; ref= reference.