These pigs had acquired lungworm infestations presumably containing masked influenza virus under natural conditions.
这些猪在自然条件下已受到含有隐蔽流感病毒的肺丝虫寄生.
辞典例句
A NEW SPECIES OF PROTOSTRONGYLID LUNGWORM FROM TAKIN ( STRONGYLATA: PROTOSTRONGYLIDAE )
羚牛原圆科线虫一新种记述 ( 圆形亚目: 原圆科 )
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