Infection of the respiratory tract is perhaps one of the most common human ailments and is a source of discomfort, disability and loss of time for most average adults. It is also a substantial cause of morbidity and serious illnesses in young children and in the elderly, including inflammation of nasal tract, nasopharynx, pharynx and larynx. Most cases are caused by virus such as rhinovirus, para influenza, respiratory syncytial virus, adenovirus, influenza A, B and C virus, etc., but some by bacteria such as pneumococcus, hemolytic streptococcus, hemophilus and staphy lococcus. Many of these viral infections run their natural course in older children and in adults without specific treatment and without great risk of bacterial complications. In young infants and in the elderly, or in persons with impaired respiratory tract function, bacterial superinfection increases morbidity and mortality rates.
In traditional Chinese medicine, this condition is often called seasonal disease or external affection, which refers to the disease or the symptoms caused by the six pathogenic factors, namely wind, cold, summer-heat, dampness, dryness, fire, as well as malignant infections and pathogenic factors.
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