were with us the dawn of history. Now, in a globalizing world, searching for new ways to attack the six billion potential victims. Sooner or later they will succeed again. epidemics known to us from history pales in scenarios that are created out by specialists in infectious diseases. Today's world is very small: people (and animals, which are often dangerous reservoirs of microbes) live in large clusters, often and quickly travel between countries and continents, and their genes are mixed up to such an extent that a clever virus or bacterium found almost anywhere a large group of potential victims.
Obviously this is not so easy, because Homo sapiens has learned a few tricks over the past few thousand years: often cook food, purifies water, isolating patients and gives them the drugs, and sometimes even washes his hands before eating. Attacking us, it became more difficult, but the microbes are patient - are multiplying and mutating so fast that I just have to eventually find a weak point. This was the case with HIV.
more: http://www.focus.pl/nauka/zobacz/publikacje/nadciaga-zaraza/
Source: www.focus.pl
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