infestation

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。

Disease caused by infestation of tissue with filariae.

感染由于变形所引起。

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

天气转暖使人们担心垃圾腐烂会引起疾病传播和鼠群猖獗。

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

结论除刺猬外，各鼠种染率和染指数较低。

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

摘要苹果园植食性昆种群数量的上升和主要种类的变替，原因是多方面的。

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“隐蔽病毒”的侵袭的猪，并不因的侵袭立即发流感。