Causes respiratory tract infection

Currently the trend of social development, the global climate change, environmental pollution, emissions, dust ... has led to the percentage of people infected with respiratory diseases increasing, especially upper respiratory tract infection.

 
Respiratory tract infections in patients with mostly moderate, but may aggravate up in subjects susceptible, causing more severe variant.

By the research and scientific experiments, it was found mostly cause upper respiratory tract infections are viral: hemolytic streptococci group A, pneumococcal and some fungi ...
Group pathogenic viruses by residents in the mucus lining of the nose and throat. We will be in it, penetrate the mucosal cells, replication and cell damage and spread to neighboring cells.
The body will resist with IgA antibodies available and army protection leukemia. Usually there will be some respiratory mucosa cells vulnerable to viruses and destruction, but after about two weeks of classes with new cells grow and push virus. But in some cases, the body does not effectively kill the virus from the respiratory tract in duplicate and penetrate down to the lower respiratory tract into the blood and cause disease variants.

It should be treated promptly and thoroughly arthritis
upper respiratory tract to avoid complications.

In addition, respiratory infections can be caused by many different causes: allergies can be caused by weather, with different types of allergens (antigens) in the air, dust, allergies or the impact of chemicals, tobacco smoke (or smoking or inhaling secondhand smoke, pipe tobacco released by others).