We can be sure that ancient civilizations knew of and were concerned about infectious diseases from several facts. The hunter gatherers rarely suffered from water borne diseases. They knew that the water that stank or did not taste well was not good to intake. Their main knowledge came from experience. During the Greek period several doctors like Alcmaeon of Croton were mentioned and hence they must have had the knowledge about infectious diseases like Cholera. Several other infectious disease treatment have also been mentioned during the Greek period.
B). Strongly linked. The only real difference is the much more developed social welfare system in Canada, which slightly alters the way tax revenues are collected and processed.
It was hard to get to city center
the slums had bad air
and it is dangerous to live in
