Agostino Bassi
A patient, meticulous researcher whose work with sick silkworms unveiled a fundamental truth: living microbes, not bad air or miasma, could be the cause of infectious disease.
1773–1856 (age 83)·Italian entomologist·Birthday: September 25
Biography
Working in near-isolation in Lodi, Agostino Bassi conducted a quiet revolution in biology. For a quarter of a century, he studied a calamity devastating Italian silk farms: the muscardine disease that turned caterpillars into hard, white mummies. Through relentless experimentation, he proved the culprit was not a vague 'insect cholera' but a specific, living fungus that could be transmitted. Published in 1835, his work was the first to demonstrate conclusively that a microorganism caused an animal disease—decades before Pasteur and Koch. Bassi didn't stop there; he boldly extrapolated his 'contagion' theory to human illnesses like plague and syphilis. Though ignored by many contemporaries, his methodical approach laid the essential groundwork for the germ theory of disease.
#1 When Agostino Was Born
The biggest hits of 1773
Agostino's Life & Times
The world at every milestone
1773Born
1778Started school
1786Became a teenager
1789Could drive
1791Could vote
1794Turned 21
1803Turned 30
1813Turned 40
1823Turned 50
1833Turned 60
1843Turned 70
1853Turned 80
1856Died at 83
Key Achievements
- Proved through systematic experiment (1807-1835) that the muscardine disease of silkworms was caused by a contagious fungus, Beauveria bassiana.
- Published 'Del Mal del Segno' (1835), a foundational text in the history of germ theory and experimental pathology.
- Correctly hypothesized that many human diseases, including measles and the plague, were caused by living, specific microorganisms.
- Developed practical control measures for silkworm disease, saving a crucial sector of the Italian economy.
Did You Know?
He was trained as a lawyer but abandoned the profession to pursue his passion for agricultural science.
The fungus he discovered, Beauveria bassiana, is used today as a natural insecticide in organic farming.
He suffered from eye problems and later blindness, which hampered but did not stop his research.
“The silkworm disease is caused by a living, parasitic fungus.”
