This study is a local, prospective, open-label, company-sponsored, non interventional, multi-center study. Patients documented must suffer from an acute exacerbation of chronic bronchitis and take at least one dose of Moxifloxacin injection.The primary objective is to obtain clinical effectiveness and safety data of Moxifloxacin injection in the treatment of acute exacerbations of chronic bronchitis in patients in whom Moxifloxacin was routinely prescribed. The secondary objective is to find out the possible correlation between the risk factors (sex, smoking, number of previous exacerbations, etc) and AECB, the different treatment effectiveness according to Anthonisen classification. This study will also collect the data of pathogens by sputum culture and the defervescence time of Moxifloxacin injection in treating Acute Exacerbations of Chronic Bronchitis (AECB).

Inclusion Criteria:

• Patients at least 18 years of age with a diagnosis of AECB treated with Moxifloxacin injection with/without sequential tablet treatment

Exclusion Criteria:

• Exclusion criteria must be read in conjunction with the local product information

Adult female and male patients with AECB, who are at least 18 years of age and are scheduled to be treated with Moxifloxacin injection, independent of the duration and severity of the underlying chronic bronchitis, can be documented after the therapy decision has been made.