Scientists to decode why common cold turns severe in kids

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria (Aim 1 and Aim 2b Community Groups): * Parent/legal guardian is willing and able to provide informed consent in English. * Willing to comply with all study procedures and be available for the duration of the study. * Younger Community Group: Generally healthy children 12 to 36 months of age at the time of enrollment * Older Community Group: Generally healthy children 5 to 17.5 years of age at the time of enrollment. * Current patient within primary care system at UW Health Inclusion Criteria (Aim 2a: Hospitalized Group): * Parent/legal guardian is willing and able to provide informed consent in English. * Admitted to American Family Children's Hospital (AFCH) within the past 24 hours * Children under 17.5 years of age at the time of enrollment * Has a diagnosis of bronchiolitis, asthma exacerbation, acute hypoxemic respiratory failure or community acquired pneumonia (CAP) OR is an infant less than 6 months of age with fever greater than 38 degrees Celsius within 24 hours of hospital admission Exclusion Criteria (all participants): * Congenital or currently acquired immunosuppressive condition or medications (e.g., congenital immunodeficiency, Leukemia, Lupus) * Congenital anomalies that might alter frequency of infection (e.g., unrepaired cleft palate, bronchial cyst, pulmonary sequestration) * Presence of tracheostomy or gastrostomy tube * Previously enrolled a different group in the study * Other child in the same household already enrolled in the study * Not suitable for study participation due to other reasons at the discretion of the investigators. Exclusion Criteria (Aim 1: Community Group Only): * History of chronic pulmonary diseases (e.g., asthma, cystic fibrosis, bronchopulmonary dysplasia (BPD)) (Note: asthma IS exclusionary) * Acute upper respiratory symptoms within the past week (7 days) at the time of enrollment Exclusion Criteria (Aim 2: Hospitalized Group Only): * History of chronic pulmonary diseases, excluding asthma (e.g., cystic fibrosis, bronchopulmonary dysplasia (BPD)) (Note: asthma is NOT exclusionary) * A positive test for any virus other than RV within the 48 hours prior to and including admission. * Non-respiratory infection at the time of admission * Neurologic disease (for example, cerebral palsy, genetic neurologic diseases, seizure disorder) Exclusion Criteria (less than 5 years old only (All participants in Aim 1 and some participants in Aim 2a): * Born prematurely, less than 32 weeks 0 days gestational age