密切接触史
History of close contact
以上为机器翻译结果，长、整句建议使用 人工翻译 。
大多数受害者都有与患病家禽的密切接触史，但是卫生官员担心病毒会获得在人与人之间传染的能力，从而导致大范围流行。
Most of the victims had close contact with sick birds, but health officials worry the virus could acquire the ability to move easily among people, sparking a pandemic.
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