Control measures are underway including contact tracing, chemoprophylaxis of household contacts, and immunization of high risk groups.

正在采取控制措施，包括接触者追踪、家庭接触者化学预防和高危群体免疫接种。

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They have been assigned to work on infection control, surveillance for new cases, and the tracing and management of contacts, and are being trained and equipped for these tasks.

已分配他们从事感染控制、新病例监测以及接触者追踪和管理方面的工作，并且正在为这些任务对他们进行培训和提供装备。

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To decrease the number of head lice episodes per unit of time, control measures should include the treatment of all household contacts.

为了减少每个时间单位内出现头虱症患者的数量，应采取包括治疗所有家庭接触者在内的控制措施。

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The water was pumped out and drained within days, but crews could not revive banks of corroded wires and electrical contacts that held relays components that deliver signal information, control switches and keep trains properly spaced from each other.

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But Facebook, the world's biggest social network, wants to keep control of its serfs' data and therefore stops them exporting contacts easily.

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