How was sanitation the greatest problem facing urban areas in the late 20th century?

There was diseases going around quickly,and rapidly. Because surgeons was not washing there hands between surgeries and there tools.Also they smoked in the OR (operating room) they didn't use gloves back then either.

Question: Am I suppose to have just one sentence or a paragraph?

yes i think there would be volunteers

well this is going to be a long answer lol ok so the visigoths were a branch of the goths who frequently raided rome, uh the hunas attacked the guptas a lot and weakened them, uuhm of course the romans used math and science in there every day lives i mean they had a whole empire to run, and rome was split into east and west by a general named diocletian. hope this you! : )