Toxigenic strains of Clostridium difficile are the major cause of intestinal tract diseases of hospitalized patients. For a long time, Clostridium difficile was considered to produce both types of toxins (A+/B+ strain). However, the investigations conducted in the last ten years point to the existence of clinically significant isolates which produce only toxin B, i.e. toxin A negative. Toxigenic strains Clostridium difficile are present in our country so this bacterium sort has to be considered in differential causal diagnosis of diarrhea syndrome. Considering that it can cause a difficult form of the disease, it is an obligation to establish the presence of some toxins in stool samples of patients and/or production of some toxins in liquid culture of isolates.