Mediafiya. The diagnosis is the first
In the Middle Ages, up to the third of the population of Europe, tens of millions of lives, took away the smallpox, cholera, leprosy and typhoid from epidemics of the plague. The deserts of cities and countries. All this nightmare stopped when the Europeans learned to monitor their hygiene, started sewers and water supply and stopped pouring sewage under the windows, that is, poisoning the environment of their habitat.