Objective: to study relation between children with recurrent respiratory trace infection and zine, selenium in serum.

目的：了解反复呼吸道感染与血清中微量元素锌、硒含量的关系。

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Objectives in order to detect the red cell immunology function and T-lymphocyte subsets of children with recurrent respiratory tract infection (RRTI).

目的探讨反复呼吸道感染患儿红细胞免疫和T淋巴细胞亚群变化的关系。

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Aim: to investigate therapy methods for children With recurrent respiratory tract infection (RRI).

目的：探讨治疗反复呼吸道感染(RRI)的方法。

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