Method: Use the method of indirect immunofluorescence, mice cross protection test and SDS -page to determine the serum type, the toxicity and the protein atlas of the isolated strains.

方法：采用间接免疫荧光法、小鼠保护试验以及SDS -聚丙烯胺电泳法，分别测定分离株的血清类型、毒力和蛋白图谱。

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Objective to investigate serum iron level and relevant factors among preschool children in Shenzhen city, and to provide scientific basis of making policy for children health protection.

目的调查深圳市学龄前儿童血清铁营养素状况及其影响因素，为制定保护儿童健康措施提供科学依据。

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Objective To investigate serum zinc level and relevant factors among preschool children in Shenzhen city, and to provide scientific basis of making policy for children health protection.

目的调查深圳市学龄前儿童血清锌营养状况及其影响因素，为制定保护儿童健康措施提供科学依据。

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