Then
Germ theory transformed surgery (with Lister’s antiseptics) and food safety, and his anthrax and rabies vaccines changed public health.
Timeline of Discovery · 19 / 30
Louis Pasteur
1822 - 1895 · France
Louis Pasteur disproved spontaneous generation, developed pasteurisation and created vaccines, making him one of the most consequential biologists in history.
- Medicine
- Biology
- Industrial & Modern
Lived
1822 - 1895
Era
Industrial & Modern
Primary field
Medicine
Signature idea
Germ theory of disease and pasteurisation
Their place in history
1822 - 1895
The question they asked
Do living microbes arise from nothing, or do they come only from other living microbes?
The Contribution
What this scientist actually did — precisely and plainly.
His swan-neck flask experiments proved that fermentation and disease are caused by microbes, and his methods kept microbes out of food and wounds.
How the Work Advanced Knowledge
The tools, experiments and reasoning behind the discovery.
He designed elegantly controlled experiments (open to air yet sterile), connected observations in chemistry and medicine, and applied innovation to practical problems.
Why It Mattered Then / Today
From their own moment in history to the world we live in now.
Today
Pasteurisation preserves milk and juices; vaccination campaigns still follow his principles and have saved billions of lives.
Important Works or Discoveries
Landmarks that carried the idea into the world.
- Studies on fermentation and germs
- The process of pasteurisation
- Vaccines for anthrax and rabies
Science knows no country, because knowledge belongs to humanity.
Sources
Where this profile was verified.
Last reviewed: 2026-09-22
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