These pigs had acquired lungworm infestations presumably containing masked influenza virus under natural conditions.
这些猪在自然
件
已受到含有隐蔽流感
毒的肺丝虫寄生。
These pigs had acquired lungworm infestations presumably containing masked influenza virus under natural conditions.
这些猪在自然件已受到含有隐蔽流感毒的肺丝虫寄生。
As a rule the swine infested with the lungworms carrying the "masked virus" did not develop swine influenza immediately upon infestation with the lungworm.
通常，受到携带了“隐蔽毒”的肺丝虫侵袭的猪，并不因肺丝虫的侵袭立即发生流感。
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