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One hundred fifty-two strains of Clostridium were isolated from 144 patients over a 14-month-peroid. These included 23 recognized species and 23 strains that were unclassified. Soft tissues or abscesses yielded 84 strains of Clostridium. Intraabdominal sites predominated, but clostridia were recovered from empyema, carcinoma, frostbite with gas gangrene, muscle abscess, aortic graft, and brain abscess. Blood cultures yielded 65 strains of Clostridium from 49 patients, representing 0.3% of 16,314 blood cultures (or 2.6% of 2,168 positive cultures). Clostridium perfringens was most common in blood, accounting for 37 isolates (57%). Clostridial bacteremia was often unrelated to the clinical setting and was found in alcoholics with aspiration or Streptococcus pneumoniae pneumonia, pulmonary tuberculosis, empyema, meningococcemia, and infantile gastroenteritis. In 20 of the 49 patients (41%), aerobic or other anaerobic bacteria were cultured concurrently from the blood. Thus, clostridial bacteremia should be interpreted with caution since there may be little correlation with the patient's clinical condition.

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