Protocol CAUSE-03 / CHEETAH

This is a one-year longitudinal, observational study of 250 urban children and adolescents with asthma and 60 without asthma, ages 6-17 years old. Participants with asthma will require daily controller therapy with inhaled corticosteroids ICS (at least Step 2 therapy). Those without asthma cannot have used asthma medications in the year prior to enrollment and cannot demonstrate bronchodilator reversibility at baseline. Phenotypic characteristics will be established at baseline, and the participants will be seen at scheduled visits over 12 months. Each participant will be asked to monitor and self-report cold symptoms and will be asked to complete up to three cold visits