May 2010
Beginner
304 pages
6h 13m
English
book
Germs, Genes, & Civilization: How Epidemics Shaped Who We Are Today
by Southern Illinois University David P. Clark - Department of Microbiology
Content preview from Germs, Genes, & Civilization: How Epidemics Shaped Who We Are Today
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3. Transmission, overcrowding, and virulence
Virulence and the spread of disease
How a disease spreads greatly affects its impact on human society. Diseases that spread efficiently will clearly infect more people. Less obvious, but no less important, its transfer mechanism determines how virulent a disease may become.
We must tackle two widespread misconceptions. Both generalizations are half true, and scientific investigations have only recently discovered their flaws. The first is the idea that because diseases adapt to their hosts, they will inevitably become milder if we just wait long enough. Thus, syphilis was extremely virulent when first introduced into Europe but nowadays is much milder. Similarly, childhood diseases such as measles ...
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