Abstract
Clostridium celatum sp.nov. was isolated from a number of fecal specimens at concentrations of 103 to 106 per gram (wet weight). The isolates are nonmotile, saccharolytic, nontoxic, nonhemolytic, and non-proteolytic. They reduce sulfite and nitrite and produce urease but no lecithinase or lipase; the major organic acids produced in peptone-glucose cultures are acetic and formic. American Type Culture Collection no. 27791, GD-1, is designated the type strain