"What could go wrong?"

Oh, great! Scientists have gone into an ancient burial plot in London and extracted bacterium from the teeth of the skeletons buried there in medieval times when 50 million people were killed by the Black Plague. The scientists have reconstructed the genetic code of the bacterium. As the blogger at Neatorama writes, "What could go wrong?"
Story here: http://www.bbc.co.uk/news/health-15278366