1.These pigs had acquired lungworm infestations presumably containing masked influenza virus under natural conditions.

1.这些猪在自然条件下已受到含有隐蔽流感病毒的肺丝寄生。

2.Disease caused by infestation of tissue with filariae.

2.肠内感染由于变所起。

3.The arrival of warm weather raises the specter of disease and increased rat infestations caused by rotting garbage.

3.天气转暖使人们担心垃圾腐烂会起疾病传播和群猖獗。

4.Conclusion The infestation ratio and the ectozoa index of these hosts were lower with the exception of hedgepig.

4.结论除刺猬外，染率和染指数较低。

5.There are lots of factors causing infestation of phytophagous pests and changes of dominate species in the apple orchards.

5.摘要苹果园内植食性昆群数量的上升和主要类的变替，原因是多方面的。

6.As a rule the swine infested with the lungworms carrying the "masked virus" did not develop swine influenza immediately upon infestation with the lungworm.

6.通常，受到携带了“隐蔽病毒”的肺丝侵袭的猪，并不因肺丝的侵袭立即发生流感。