A WHO team with expertise in virology and laboratory diagnosis has collaborated with national experts in the investigation of the cases in Hunan.

世卫组织一个具有病毒学和实验室诊断方面专长的小组已与国家专家合作调查湖南的这些病例。

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Investigation: Guide users to process the problem diagnosis.

Investigation：指导用户处理问题诊断。

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Introducetion: in human cytogenetics, the advent of fluorescence molecular techniques has brought forth new procedures for chromosome investigation and diagnosis.

前言：在人类细胞遗传学中，荧光分子技术的出现带来了一些染色体研究和诊断的新方法。

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Managers said they had started their own investigation when the diagnosis was made a week earlier.

BBC: Legionella bacteria