Polio

[We're assuming you can access the threadreader.]

DR wrote: "Interesting read, in my 'umble, on Polio:"

https://threadreaderapp.com/thread/1005127713848463361.html

Many parallels with today.

[This is one small part of it:]

19. Koch’s Postulates were some research guidelines that basically stipulated there was a single causative microbe for every disease. It WAS true for all of the other diseases: cholera, typhoid fever, diphtheria.

20. Over the next few years, scientists discovered that many things could cause a poliomyelitis—it wasn’t just arsenic. There were several other viruses and bacteria that if injected directly into the nervous system could cause lesions that would trigger paralysis.

21. But the cloud of Koch’s Postulates hung over their research, and many scientists felt that—like all the other diseases—poliomyelitis HAD to be due to ONE thing: a bacteria or a virus. They just had to find it.