The evolution of diagnostic criteria for polio can be summa…

The evolution of diagnostic criteria for polio can be summarized from the provided sources as follows, focusing on key developments and changes over time:
1. **Early Clinical Descriptions:**
- **1789:** The first clinical description of polio was provided by British doctor Michael Underwood, followed by formal recognition as a condition by German physician Jakob Heine in 1840[2][3].
- **1908:** Karl Landsteiner and Erwin Popper identified poliovirus as the infectious agent causing polio by filtering preparations of spinal cord fluid from a person who had died of polio and injecting these into monkeys, which then developed polio[1].