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C. difficile hypervirulence genes identified

Five genetic regions have been identified that are unique to the most virulent strain of Clostridium difficile (C. difficile), the hospital superbug. Researchers writing in BioMed Central's open access journal Genome Biology studied the genome of the bacterium, looking for genes relating to motility, antibiotic resistance and toxicity.

Brendan Wren from the London School of Hygiene & Tropical Medicine worked with a team of researchers at The Wellcome Trust Sanger Institute to compare the genomes of three strains of the bacterium, the hypervirulent '027' strain, an historic, non-epidemic 027 strain and one less related and also non-epidemic '630' strain. He said, "C. difficile is the most frequent cause of nosocomial diarrhoea worldwide. In the past five years a new group of highly virulent C. difficile strains has emerged to cause outbreaks of increased severity in North America and Europe. Several studies have shown that patients infected with these '027' strains have more severe diarrhoea, higher mortality and more recurrences. This study provides genetic markers for the identification of 027 strains and offers a unique opportunity to explain their emergence".
 
 

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