Airway Microbiome of Patients With Protracted Bacterial Bronchitis

Inclusion Criteria: * Children with PBB diagnosis according to case definition * Consent form signed by parents or legal guardians Exclusion Criteria: * Comorbidities (HIV, asthma, chronic obstructive pulmonary disease, diabetes) * Have had serious illnesses (meningitis, pneumonia, bacteremia, empyema, etc) in the previous three months, identified only at the time of enrollment. * Have chronic respiratory conditions at the time of enrollment (non-PBB bronchiectasis not caused by PBB, CF, allergy, etc.). * Having received mechanical ventilation. * Having been hospitalized or used antibiotics in the previous three months at the time of enrollment.