Cold

 

Colds, people often say "cold" is actually refers to two diseases, namely "common cold" and "influenza", generally we say is common cold. The common cold also known as "upper respiratory tract infections", the Motherland Medicine "cold &quot, is caused by a variety of viruses of the respiratory tract diseases, of which 30%-50% is caused by a certain type of serum nasal virus. Although the common cold is more than early winter, but any season, such as spring, summer can also occur, different seasons of influenza virus disease is not the same. Influenza is an acute respiratory tract infectious disease caused by influenza viruses. Viruses exist in the patient's respiratory tract and infect others by droplets when they cough and sneeze.


About 70%-80% of acute upper respiratory tract infections are caused by viruses. The main influenza viruses (a, B, c), influenza virus, respiratory syncytial virus, adenovirus, nasal virus, Ebola virus, Coxsackie virus, measles virus, rubella virus. Bacterial infections can occur directly or after viral infections, with hemolytic streptococcus as many, followed by Haemophilus influenzae, pneumococcus and Staphylococcus. Occasionally Gram-negative bacilli. The main manifestation of its infection is rhinitis, sore throat or tonsillitis.


When there is cold, rain, excessive fatigue and other predisposing factors, so that the systemic or respiratory tract local defense function decreased, pre-existing in the upper respiratory tract or from the outside invasion of viruses or bacteria can rapidly reproduce, causing morbidity, especially the young and young people with chronic respiratory diseases such as paranasal sinus inflammation, tonsillitis, more susceptible to disease.


Nasal cavity and pharyngeal mucosa congestion, edema, epithelial cell destruction, a small number of mononuclear cells infiltration, there is serous and mucous inflammatory exudation. After the bacterial infection, there are neutrophils infiltration, a large number of pus secretion.

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