在鸡身上观察到，一种叫滤过性病原体的病毒，很少能从它诱发的恶性肿瘤中恢复过来。

As observed with the chickens, the filterable agent, a virus, could seldom be recovered from the malignant tumor which it had induced.

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俄亥俄州立大学滤过性病原体学者理查德·西里蒙研究了三十五年禽流感。 他说，“我们有个疑问，每次流感大流行的间隔时间内，这种病毒藏身于何处？

“One of the challenges is where does this virus persist between pandemics?” said virologist Richard Slemons of Ohio State University, who has studied bird flu for 35 years.

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