Most species of the genus Clostridium are saprophytic organisms that ferment plant polysaccharides [2] and are found in many places in the environment, most notably the soil.

The currently accepted taxonomy based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)[4] and the National Center for Biotechnology Information (NCBI).

Thermanaeromonas, Desulfovirgula] "Sulfobacillia" "Thermaerobacteria" "Carboxydothermales" "Thermacetogeniales" Moorellales {"Moorellia"} "Calderihabitantales" "Koleobacterales" Zhaonellaceae "Desulfitibacterales" "Syntrophomonadia" Gelria ♦ "Symbiobacteriia" ♦ Actinomycetota Nitrospirota "Thermodesulfobiota" ♦ Elusimicrobiota "Halanaerobiia" ♦ Acidobacteriota Chitinivibrionia "Planctobacteria Thermolithobacteria "Carboxydocellales" "Thermincolia" "Desulfofundulaceae"

"Selenomonadia" Limnochordia "Desulfotomaculia" "Desulfitobacteriia" "Peptococcia" "Dethiobacteria" "Natranaerobiia" Fusobacteria {Fusobacteriota} Acholeplasmatales Erysipelotrichia Mollicutes Bacilliia {Bacillota s.s.} "Clostridiia" s.s. (incl.

Erysipelotrichia, Mollicutes) Selenomonadia "Syntrophomonadia" "Peptococcia" "Dehalobacteriia" "Desulfitobacteriia" "Thermacetogeniales" {DSM-12270} "Moorellia" "Carboxydocellales" {GCA-003054495} "Thermincolia" "Carboxydothermales" {Z-2901} "Desulfotomaculia" "Thermosediminibacteria" "Thermoanaerobacteria" Clostridiia s.s. (incl.

[13] Patients that have been subjected to fecal microbiota transplants to treat their CDI have seen improvements in their mood and mental health.