Good tracing and management of contacts helps to ensure that possible cases are isolated prior to the onset of symptoms, when the risk of transmission to others is highest.
良好的接触者追踪和管理有助于确保当向其他人传播的危险最大时在症状出现之前将可能病例隔离。
She reported no history of contact with live birds and poultry in the days before showing symptoms. Her close contacts are under surveillance and are isolated.
病人称，出现症状之前的数日内，没有接触过活禽及家禽的历史。
But each thing is not isolated, they contacts and restrains mutually.
而每一事物都不是孤立存在的，它们之间相互联系、相互制约着。
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