Why is virus infected with to cause _'s general knowledge of asthma

Why is virus infected with to cause _'s general knowledge of asthma
As everyone knows, ordinary cold and airway infection are the most common trigger factor of children's asthma, the up and down airway infection that and the virus causes accounts for 85% in children, and can often meet airway infection caused by virus and bring out some to already reach, control the asthma infant's condition to obviously aggravate well, some infants even present the lasting state of asthma and need hospital treatment.
Why is virus infected with to cause asthma
Can be seen from above, it has important function while breaking out that the virus of respiratory tract is infected with and happened and acute at bronchus asthma, then why can outbreak causing asthma is virus of respiratory tract infected?
1,The virus of respiratory tract not only can be regarded as and infected the source, can also be regarded as "anaphylactogen, bring out the organism and produce specific IgE, this kind of virus -specific IgE stays on the mucomembranous loose cells of respiratory tract for a long time, the allergy takes place with invading "anaphylactogen again, thus has increased the release of the inflammation medium and hastened to melt, cause the smooth muscle of angry way to shrink, bring out asthma.
2,It can cause the function of 2 adrenergic receptors of to reduce that the virus of respiratory tract is infected, at the same time also can increase sensitiveness whose angry dishes of choline is can neural, thus make angry dishes of reactive increase and bring out asthma.
3,Respiratory tract virus infect, can destroy upper leather cell that link closely with angry way directly, make the intersection of cover and penetrating the intersection of and increase, the intersection of feeling and nerve endings in the angry way expose on the angry dish, leather protective action lose on the angry way, inflammation release of medium increase in the angry dish, thus bring out angry dishes of high reactivity and asthma.
4,Respiratory tract virus can also make the intersection of infant and upper leather interval of cell that angry way link up closely increase widely infect, thus it causes the chronic inflammation of angry way to make other "anaphylactogen of external world take advantage of a weak point, lead to the fact stingy way of infant block kind dishes of reactivity increase obviously then stridulates. So, the children with allergic physique lie between air a disease led more easily.
Virus infect with asthma that bring out get up disease to be relatively worried often, disease can be seen sneeze, flow tears, swallow, ache, generate heat, cough for the first time, then out of breath, exhaling asthma and acute symptom that breaks out of having difficulty in breathing etc. appear, can be heard in lung auscultation and the obvious sound of chirping of heavy breathing. Some typical infant show as, cough, heal for a long time only among them, especially in night and more serious or move about, cry noisily, in early morning. If does not diagnose clearly to the not typical asthma infant of this part, often cause infants to seek medical advice everywhere in time, the course of disease is very long, it is one of the reasons to cause children's chronic cough too.
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