One of the reasons diseases were being passed is because that there were not enough supplies and buildings for all of the people in rome, and then because of that diseases were getting passed more easily. Another reason on top of that was that the pipes in rome that would transport water were made of lead, and people could get lead poisoning. Atilla The Hun did not go in rome because he knew everybody there had malaria, which was travelled through mosquitoes and took a big part in the fall of rome. Diseases took a big blow off of rome.
The Roman Empire fell because of many factors and falling politics. One of the reasons was Rome having emperors that were probably the son of the previous emperor, and they were very unfit for their position, because they knew nothing, or they were mentally unstable. Another reason for the fall of the empire would be because there was no system to replace an emperor, and they would die so quickly, because their guard would kill them by getting money from people who wanted the emperor to