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Well I'm no expert, but I can think of an alternative interpretation to this datapoint...
For instance, is a strep throat caused by a colonization of strep bacteria in one's throat, based on your understanding?
Two monkeys were injected and both died within days. One of the monkeys showed paralysis. Both showed spinal lesions consistent with polio in humans. The material injected had been run through a filter small enough to stain out bacteria, and the sample was cultured to prove that no bacteria was present.
Polio is caused by Poliovirus.