the often cited Landsteiner and Popper experiment simply showed that drilling a hole in the head of a monkey and injecting biological material into the hole causes paralysis in a few of the monkeys.
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.
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.
https://pmc.ncbi.nlm.nih.gov/articles/PMC112492/