少数病例似乎有过和猪的接触史。
Few of the cases appear to have had any contact with live pigs.
对接触源的调查表明均有与死禽接触史。
Investigations into the sources of exposure indicate a history of contact with dead birds in each case.
这些患者中的大多数报告有与病禽直接接触史。
Most of these patients have reported a history of direct contact with diseased poultry.
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