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International typing study of toxin A-negative, toxin B-positive Clostridium difficile variants.
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Genotyping of outbreak-related and sporadic isolates of Clostridium difficile belonging to serogroup C.
Slow Epidemic of Lymphogranuloma Venereum L2b Strain - Volume 11, Number 11—November 2005 - Emerging Infectious Diseases journal - CDC