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［英］／ＫｒａｍｅｒＵ…／／Ｌａｎｃｅｔ－１９９９，３５３（９１５１）－４５０－４５４儿童过敏性疾病的发病率近１０年来有所升高，一种假设认为，这一趋势的部分原因可能是因儿童早期接触各种感染的机会减少引起的。如果这一假设成立，则可以通过早期接触户外环境来预
[English] / KramerU ... // Lancet-1999,353 (9151) -450-454 The incidence of allergic disease in children has risen in the past 10 years. One hypothesis suggests that part of this trend may be due to children Early exposure to various infections reduces the chance of causing. If this assumption holds, then it can be pre-exposed to early exposure to the outdoor environment