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流感肺丝虫寄生。
These pigs had acquired lungworm infestations presumably containing masked influenza virus under natural conditions.
这些猪在自然条件下已受到含有流感肺丝虫寄生。
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“”肺丝虫侵袭猪,并不因肺丝虫侵袭立即发生流感。
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