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A new study published in BMJ conducted by investigators at two large hospitals in The Netherlands shows that a trained dog was able to detect Clostridium difficile with high estimated sensitivity and specificity, both in stool samples and in hospital patients infected with C. difficile.

The plague-causing bacteria Yersinia pestis evades detection and establishes a stronghold without setting off the body's early alarms. New discoveries reported this week help explain how the stealthy agent of Black Death avoids tripping a self-destruct mechanism inside germ-destroying cells.