调查确定该男子在症状出现前不久在家中从阻塞的屋顶水糟中清理鸽粪。
The investigation determined that the man cleaned pigeon faeces from blocked roof gutters at his home shortly before symptom onset.
正在开展调查以便确定该男子的接触源。
Investigations are being undertaken to determine the source of the man's exposure.
“是的，我确定”男子说道。
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