There is a lesson in 1345 they had nothing to help them BUT they survived. Today by following common sense such as masks, hand washing avoiding crowds limits the chances of being infected until a good vaccine is available. Then all we have to pray for is the lab in Wuhan (which is reopened) doesn't accidentally let lose another virus. Which in 1345 they didn't have a lab playing with deadly viruses or the knowledge or access to clean water and didn't know about germs, viruses
And yet, throughout history, most pandemics have begun in East Asia, way before there were virology labs and we even understood what viruses are. The Kansas (Spanish) Flu of 1918 is one of the few exceptions.