During a severe 1897 dysentery epidemic in Japan that saw mortality rates reach 30 percent, Kiyoshi Shiga identified the specific microorganism responsible for the illness. This discovery of Shigella dysenteriae and the subsequent identification of the Shiga toxin provided a fundamental advancement in bacteriology and immunology that remains a cornerstone of medical science today.
Early Career and Microorganism Identification
Born in Sendai in 1871, Shiga attended the University of Tokyo before joining the Institute for the Study of Infectious Diseases. Working as an assistant to Kitasato Shibasaburō, he utilized Koch's Postulates and gram staining methods to isolate the pathogen causing dysentery. Initially naming the discovery Bacillus dysenteriae, he eventually classified the organism as a gram-negative bacillus, leading to the creation of the Shigella genus.
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Between 1901 and 1905, Shiga worked in Heidelberg alongside Paul Ehrlich. Their collaboration focused on chemotherapy treatments for trypanosomiasis, a disease caused by protozoan microorganisms. This partnership resulted in the development of the drug trypan red. Shiga returned to Japan in 1905 with an established international reputation to continue his research within Kitasato's laboratory.
Institutional Leadership and Public Health
Shiga balanced academic roles with senior administrative positions. In 1920, he became a professor at Keio University. Later, he served as the president of Keijō Imperial University in Korea from 1929 to 1931, concurrently acting as a senior medical advisor to the Japanese Governor-General. His later career involved significant advocacy for tuberculosis prevention, notably facilitating the arrival of the BCG Tokyo 172 strain to Japan in 1924.
Fast facts
- Born: 1871, Sendai
- Died: 1957, Sendai
- Education: University of Tokyo
- Major Discovery: Shigella dysenteriae
- Key Award: Order of Culture (1944)
- Professional Affiliation: German Academy of Sciences Leopoldina
- Academic Role: President of Keijō Imperial University
- Legacy: Shiga toxin nomenclature
Questions readers ask
What is the Shiga toxin?
It is a potent toxin produced by the Shigella dysenteriae bacteria, which Shiga discovered while researching the causes of dysentery.
Did Kiyoshi Shiga develop a successful vaccine?
He attempted to create a vaccine using the toxin, including self-testing, but the experiments were ineffective and were ultimately discontinued.
Achievements
- Held posts at Keijō Imperial University
- Educated at University of Tokyo
- Fields of research: medicine
