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Respiratory Tract Infection

Respiratory tract infections (RTIs) are infections of parts of the body involved in breathing, such as the sinuses, throat, airways or lungs. Most RTIs get better without treatment, but sometimes you may need to see a doctor. Common colds are the most prevalent entity of all respiratory infections and are the leading cause of patient visits to the physician, as well as work and school absenteeism. Most colds are caused by viruses. Parainfluenza viruses, respiratory syncytial virus, adenoviruses and influenza viruses have all been linked to the common cold syndrome. All of these organisms show seasonal variations in incidence.


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Clinical Significance

Mycoplasma Pneumonia:

40% of patients with community-acquired pneumonia (CAP) are caused by mycoplasma pneumonia, and the infection rate is 12-17%.

Chlamydia pneumonia:

10% of CAP patients are caused by chlamydia pneumonia, and the infection rate is 1-5%.

Legionella Pneumophila:

LP is popular in summer and autumn, especially in the enclosed space with central air conditioning, with a infection rate of 2-5%.


ADV pneumonia mostly occurs in infants aged 7-24 months, with an infection rate of 15-20%.

Respiratory syncytial virus:

RSV ranks the first in viral pneumonia in children and may lead to death.

Influenza virus:

Influenza A occurs every year, while influenza B occurs every 3-6 years. The number of infected people exceeds 20% of the total population.

Coxsackie B virus:

Coxsackie B virus infection is mostly associated with respiratory tract infection, myocarditis, meningitis, hand-foot-mouth disease (HFMD) and other diseases.


Enterovirus mostly leads to HFMD, and often occurs in preschool children and can cause serious neurological and respiratory diseases.


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