其原因也许在于童年时期感染幽门螺旋杆菌能让免疫系统学会适当地反击外源抗原，这样长大后就不会因为反应过激而出现哮喘。
It could be that encountering Helicobacter as a kid teaches the immune system how to react, and not overreact as in asthma to future allergens.
其原因也许在于童年时期感染幽门螺旋杆菌能让免疫系统学会适当地反击外源抗原，这样长大后就不会因为反应过激而出现哮喘。
It could be that encountering Helicobacter as a kid teaches the immune system how to react, and not overreact as in asthma to future allergens.
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