Diagnosing Respiratory Disease in Children Using Cough Sounds

Inclusion Criteria: * Infant or child aged 29 days - 12 years * Presenting to the study site with signs or symptoms of respiratory disease including cough, wheezing, stridor, chest in-drawing/retractions, difficulty breathing, fast breathing, abnormal lung sounds on exam, cyanosis/hypoxemia. * Coughing spontaneously or able to cough voluntarily Exclusion Criteria: * Lack of a signed consent form from parent or legal guardian * Lack of signed assent form for children aged 7 years or older who, in the opinion of the investigator, is able to provide assent based on their age, maturity or psychological state. * Need for mechanical ventilatory support (including invasive, continuous positive airway pressure, or bilevel positive airway pressure) or high flow nasal cannula * Any medical contraindication to voluntary cough, including (only enrolled if coughing spontaneously): severe respiratory distress, history of pneumothorax, eye/chest/abdominal surgery in past 3 months, hemoptysis in the past month, or too medically unstable to participate in study per treating clinician. * Subject previously enrolled * Tracheostomy present or tube placed