Influenza<unk> 
Pneumonia
Sinusitis
Toxic exposure
Pyelonephritis
Bronchitis
Coronavirus
MERS-CoV
SARS-CoV
2019-nCoV (COVID-19)
MERS-CoV
SARS-CoV
2019-nCoV (COVID-19)<unk>  (rhinitis, sinusitis, pertussis)
LRI (bronchitis, pneumonia)
Influenza
Allergy
Asthma
Environmental irritants
Transient airway hyperresponsiveness
Foreign body
SARS
Postinfectious; pertussis
Smoking and/or chronic bronchitis
Postnasal discharge
Asthma
GERD
ACEI/ARB
CHF
Lung cancer or intrathoracic mass
Emphysema
Interstitial lung disease
Psychiatric
Upper respiratory infection
Influenza
Allergic rhinitis
URI
Croup
Pneumonia
Pulmonary chemical agents
Sinusitis