Most commercial phages in the US (can't speak for the rest of the world) are comprised of these 4:

LH01 – Myoviridae LL5 – Siphoviridae T4D Myoviridae LL12 – Myoviridae

You can research all of these, but these 4 specifically target a specific but broad range of potentially pathogenic bacteria, including E. Coli (though not all E. Coli is bad) and other species. Generally if you take them together they provide effective treatment against a broad range of inflammatory agents.

Disclaimer: Not a doctor, just someone who suffered decades of gut problems and eventually healed himself.