> what if there's new viruses or bacterium contained under previously frozen earth for which modern medicine isn't prepared for? A group at Harvard found that

> what if there's new viruses or bacterium contained under previously frozen earth for which modern medicine isn't prepared for? A group at Harvard found that the traits that now enable enterococcal survival and transmission in hospitals were an advantage in the Paleozoic [0] and suggest that the multidrug resistant (i.e., untreatable) strains seen in hospitals were trained to be that way millions of years ago. There was also a split between commensal/friendly and unfriendly enterococci around the time of urbanization. So it's certainly possible that we'd encounter something we don't have an answer for. It has already been seen, in a way. [0] http://www.cell.com/cell/fulltext/S0092-8674(17)30478-6 http://www.cell.com/cell/fulltext/S0092-8674(17)30478-6