Robert Koch — "I believe that every disease has a specific cause, and that cause can be identif…"
I believe that every disease has a specific cause, and that cause can be identified.
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More from Robert Koch
"I have always been fascinated by the invisible world of microbes."
"The time has come when we can look forward to the eradication of tuberculosis."
"I have always striven to verify my observations by every possible means."
"I have worked like a man possessed, but not for fame or money."
"A doctor must be able to do two things: see microscopically and think logically."
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Understanding this quote
What it means
Diseases aren't random misfortunes — they have specific, findable causes. Koch is asserting that illness follows natural laws: there is always a definite agent responsible, and systematic investigation can uncover it. This rejects vague explanations like 'bad air' or divine punishment, declaring instead that medicine could become a true science — where identifying the cause made prevention and cure genuinely possible.
Relevance to Robert Koch
Koch lived this belief literally. He isolated the bacterial agents behind anthrax (1876), tuberculosis (1882), and cholera (1883), transforming each from mysterious killer into knowable enemy. He codified the principle as Koch's Postulates — a four-step framework proving which microbe causes which disease — converting personal conviction into scientific method. His 1905 Nobel Prize for tuberculosis research confirmed that this lifelong certainty was both correct and world-changing.
The era
Koch worked in the 1870s–1900s when miasma theory — disease arising from 'bad air' and decay — still competed with Pasteur's emerging germ theory. Tuberculosis killed roughly one in seven Europeans; cholera swept cities in repeated pandemics. Industrialization crowded workers into unsanitary urban slums with no causal framework for illness. Claiming every disease had an identifiable specific cause was radical optimism in an era that accepted epidemic death as inevitable fate.
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