<unk>  is the illness caused by an acute<unk>  which involves the<unk><unk>  tract: nose, sinuses, pharynx or larynx. In the United States, this represents approximately one billion acute<unk><unk>  illnesses annually.
Upper respiratory tract infection
Lower respiratory tract infection
Cough in children
Croup
Asthma risk factors
Pulmonary aspiration
Asthma laboratory findings
Smoke inhalation