''Clostridium difficle'' is a gram positive bacteria of the family ''Clostridiaceae''. They are normally part of the normal flora, so known as a commensal bacteria. The problem arises when the bacteria competing within the host are destroyed by antibiotics.
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''C. difficle'' become overpopulated, and begin to produce pathogenic strains producing toxins, namely enterotoxin and cytotoxin. These may cause diarrhoea, and abdominal pains, or pseudomembranous colitis (PMC) under more severe circumstances.