Nevertheless, pore-forming cytotoxins haemolysin BL (Hbl), non-haemolytic enterotoxin (Nhe) and cytotoxin K (CytK) have been identified as etiological agents of the diarrheal disease (Lund and Granum, 1996; Lund and Granum, 1999; Lund et al., 2000). The gene discussed is SLC9C1; the disease is diarrheal disease.