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Before germ theory, disease was attributed to 'miasma' (bad air), imbalanced humors, or divine punishment. Louis Pasteur (France) and Robert Koch (Germany) established in the 1860s–80s that specific microorganisms cause specific diseases — Pasteur through his experiments disproving spontaneous generation and developing vaccines; Koch through isolating the tuberculosis and cholera bacilli and formulating 'Koch's Postulates' for proving causation.
Germ theory's implications transformed medicine: Ignaz Semmelweis had already shown hand washing reduced childbed fever deaths (1847), though he was initially ignored. Joseph Lister developed antiseptic surgical technique using carbolic acid (1867). Together, germ theory, antiseptic surgery, and vaccine development have extended average human lifespan from 40 to 75+ years in two centuries.
# Top 10 Germ Theory facts
- 1Ignaz Semmelweis proved hand washing prevented maternal deaths in 1847 — doctors ignored him and he died in an asylum
- 2Pasteur developed vaccines for chicken cholera, anthrax, and rabies — each by weakening the pathogen
- 3Koch isolated the tuberculosis bacterium in 1882 — at the time TB killed 1 in 7 Europeans
Fascinating Facts
- ◆Ignaz Semmelweis proved hand washing prevented maternal deaths in 1847 — doctors ignored him and he died in an asylum
- ◆Pasteur developed vaccines for chicken cholera, anthrax, and rabies — each by weakening the pathogen
- ◆Koch isolated the tuberculosis bacterium in 1882 — at the time TB killed 1 in 7 Europeans
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