where to find pathogenicity metadata for E.coli genomes
you can use BacDive. This is the largest database for bacterial metadata.:
https://bacdive.dsmz.de/
e.g. you can search for the sequence accession "NCTC8196" and you would get the metadata of the according strain:
https://bacdive.dsmz.de/search?search=NCTC8196

What kind of data is available, is highly dependent on the strain. Usually type strains are more rich on data that others.

For further questions don't hesitate to contact us:
contact@bacdive.de