已开展调查确定该男子的接触源。
Investigations have been undertaken to determine the source of the man's exposure.
该病例的现场调查确定，两名同胞在他住院前5天死亡。
A field investigation of this case determined that two siblings had died 5 days before his hospitalization.
随后的调查确定，至少发生了一些老虎与老虎之间的病毒传播。
Subsequent investigation determined that at least some tiger-to-tiger transmission of the virus occurred.
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