He can’t help himself: “There was no field of "virology", until DNA was discovered, and viruses could be viewed by actual microscopy and electron microscopy.”Joe, sometimes you just need to move on.
Yes, there was a great deal we know now or learned since then that they didn’t know. They were starting to ask better questions and either didn’t believe the answers they got or didn’t understand what they were learning yet.
As they learned more, new fields of medicine were created.
This is not the same thing as saying they had no idea what was going on - their understanding was in its infancy. The difference between a kid thinking addition/subtraction is the culmination of mathematics and gradually learning about calculus, geometry, etc.
You do you however. I wish you’d just admit your initial categorization here wasn’t accurate.
The identification of the causative agent of tobacco mosaic disease(TMV) as a novel pathogen by Martinus Beijerinck (1898) is now acknowledged as being the official beginning of the field of virology as a discipline distinct from bacteriology.