ɔːlðˈoʊ sˌʌm pətˈɛnʃəl vˈɪɹələns fˈæktɚz ˈiː.dʒˈiː. ˈɛndoʊtˌɑːksɪnz, hˈiːməlˌɪsɪnz, ˈɛntɚɹˌoʊɾəksˌɪnz, ɐdhˈɪɹəns fˈæktɚz hɐvbɪn aɪdˈɛntᵻfˌaɪd, ðɛɹ pɹɪsˈaɪs ɹˈoʊlz ɑːɹ ʌnnˈoʊn.
Although some potential virulence factors (e.g. endotoxins, hemolysins, enterotoxins, adherence factors) have been identified, their precise roles are unknown.