"Researchers at the University of Warwick, working with Italian anthropologist Raffaella Bianucci and others, have recovered a genome of the bacterium Brucella melitensis from a 700-year-old skeleton found in the ruins of a Medieval Italian village." Source: Warwick News & Events.
Comment: One of these days, archaeologists are going to accidentally discover some deadly ancient organism which will come back to life in the basement of a museum and proceed to run amok. No, wait--that's the plot of Relic.
In this case, the organism in question causes brucellosis, which is bad enough, I suppose, though not quite so dramatic. "Symptoms include fevers, arthritis and swelling of the heart and liver. The disease is still found in the Mediterranean region."