The 1st-stage larvae of small lungworms have good resistance to environment, 4 terrestrial mollusca are confirmed as intermediate hosts of them.
小型肺线虫1期幼虫对外界抵抗力很强,发现4种软体动物可作为中间宿主。
2
As a rule the swine infested with the lungworms carrying the "masked virus" did not develop swine influenza immediately upon infestation with the lungworm.