“The combined death rate from scarlet fever, diphtheria, whooping cough and measles among children up to fifteen shows that nearly 90 percent of the total decline in mortality between 1860 and 1965 had occurred before the introduction of antibiotics and widespread immunization. In part, this recession may be attributed to improved housing and to a decrease in the virulence of micro-organisms, but by far the most important factor was a higher host-resistance due to better nutrition.” — Ivan Illich, Medical Nemesis, Bantam Books, 1977

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