Experimental: Asthma

Physician diagnosis plus at least one of the following in the past year: asthma symptoms that improve with albuterol; prescribed asthma controller medication(s); an acute asthma exacerbation requiring systemic steroids; or an emergency department visit or hospitalization for asthma. Alternatively, report of current asthma symptoms per US NAEPP or Global Initiative for Asthma (GINA) guidelines, plus documentation of bronchodilator response or airway hyperresponsiveness.

Experimental: Chronic Obstructive Pulmonary Disease (COPD)

Physician diagnosis, plus symptoms of COPD per GOLD guidelines, plus post-bronchodilator FEV1/FVC \<0.70 or below the lower limit of normal (LLN) using GLI reference equations.

Experimental: Cystic Fibrosis (CF)

Physician diagnosis based on U.S. CF Foundation guidelines, including signs/symptoms of CF and either a positive sweat chloride test (\>60 mmol/L), or an indeterminate sweat chloride test (30-59 mmol/L) plus two CF-causing CFTR mutations. The study may include subjects with different CFTR mutation classes as well as both on and off CFTR modulators.

Experimental: Other Airway Diseases

This group will include subjects with airway ciliary motility disorders, bronchiectasis, and airway malaria. Given variability in the clinical presentation and diagnosis of these conditions, they will be ascertained by physician diagnosis and reviewed by study physician investigators.

Experimental: Healthy Controls

This will include generally healthy subjects who do not have any of the airway diseases included in the study, nor other chronic cardiorespiratory or other diseases that may alter lung function or the ability to participate in the study.