Figure 3

Relationship between the detection rate of virus and chronic obstructive pulmonary disease (COPD) acute exacerbation. (A) Relationship between influenza virus (IFV) and COPD acute exacerbation. (B) Relationship between human corona virus (hCoV) and COPD acute exacerbation. (C) Relationship between human rhinovirus (hRV) and COPD acute exacerbation.