Research suggests that the risk of HIV infection in this way is extremely small.

研究表明，这种方式感染HIV病毒的风险非常小。

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Further investigations are under way to identify the source of her infection.

正在开展进一步调查以确定其感染源。

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Further investigations are under way to identify the source of her infection.

正在开展进一步调查以确定其感染源。

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