1902 Nobel Prize in Physiology or Medicine — Ronald Ross
What You Will Learn in This Article
Discover how humanity learned that malaria is caused by mosquitoes, not by “bad air,” and why the British Empire had no choice but to invest heavily in science to maintain its colonies.
No One Knew That Mosquitoes Were the Culprits
Malaria. The very name comes from the Italian for “bad air” (mala aria). For thousands of years, people believed that the miasma from swamps caused the disease. This belief persisted among Hippocrates, the Romans, and even doctors in the early 19th century. They thought that breathing in the humid air of the tropics would lead to fever.
In 1880, Charles Laveran, a French army physician (who would later win the 1907 Nobel Prize), discovered parasites in the blood of malaria patients, which challenged the “bad air” theory. However, the question of how these parasites entered the human body remained a mystery. The answer was found by Ronald Ross, and his discovery was driven by the interests of the British Empire.
The Landscape of the Time — The Achilles’ Heel of the Empire on Which the Sun Never Sets
1902 was the year the Second Boer War (1899-1902) ended. Britain had secured gold and diamonds in South Africa, but the war revealed a shocking fact: more soldiers died from disease than in battle. Typhoid, dysentery, and malaria.
This was not just a problem specific to the Boer War. The British Empire, which ruled a quarter of the world, was losing soldiers and officials to malaria in its core regions: India, Africa, and Southeast Asia. In India alone, millions died from malaria each year. The very survival of the empire was at stake.
Ross’s 18-year tenure (1881-1899) as a military doctor in India was no coincidence. The British Empire deployed military doctors to conduct tropical medicine research to address the health problems in its tropical colonies, and Ross was a product of this system. In the same year in Korea, King Gojong of the Korean Empire was celebrating his 40th year on the throne. In an era when Western powers were dividing the world, even science served as a tool of the empire.
If we use a computer science analogy, the colonial medicine of the British Empire can be seen as a kind of infrastructure monitoring system. It tracked down the causes of failures (infectious diseases) and applied patches to prevent the system (colonies) from going down. Ross’s research was the task of tracing the network path of these failures.
A Doctor Who Became a Poet, a Poet Who Became a Doctor
Ronald Ross (1857-1932) was a British man born in India. His father was a British army officer stationed in India. He studied medicine at St. Bartholomew’s Hospital in London, but he was passionate about poetry, novels, painting, and mathematics. Medicine was his father’s wish, but Ross dreamed of being an artist.
In 1881, at the age of 24, Ross joined the Indian Medical Service. He also served in the Third Burmese War (1885). While in India, he saw malaria patients every day, but for some time, he simply performed his duties. The turning point came in 1894 when he met Patrick Manson during a vacation in London.
Manson was known as the “father of tropical medicine.” He proposed a bold hypothesis to Ross: “Malaria is transmitted by mosquitoes.” This seemed like a wild claim at the time. However, Manson’s logic was persuasive, and Ross decided to return to India to prove this hypothesis.
20 Days of Mosquito Dissection — Tracing Packet Routing
In Secunderabad, India (now Hyderabad), Ross embarked on a grueling experiment. He fed the blood of malaria patients to mosquitoes and then dissected them to see if he could find parasites in their digestive tracts.
The problem was that there were dozens of species of mosquitoes. Without knowing which species transmitted malaria, he had to catch and dissect every kind of mosquito. In the sweltering heat of India, he sat in front of a microscope and repeatedly dissected the stomachs of hundreds of mosquitoes.
On August 20, 1897, Ross discovered malarial parasites in the stomach wall of Anopheles mosquitoes. This was the decisive evidence of the transmission route. Ross commemorated this day for the rest of his life, and it became known as “Mosquito Day.”
If we use a network security analogy, this is like tracking the attack path using packet capture (pcap). He examined the intermediate nodes one by one to see which router (mosquito) the malicious traffic (parasites) passed through to reach the target server (human). However, this analogy has its limitations. In a network, packets “pass through” routers, but in malaria, parasites grow and transform inside the mosquito. The mosquito is not just a relay but also a breeding server for the parasites.
A Dispute Over Priority with Grassi
There is an uncomfortable side to scientific history. While Ross was proving the link between mosquitoes and malaria, an Italian parasitologist named Giovanni Grassi was independently conducting the same research. Grassi demonstrated the role of Anopheles mosquitoes in human malaria and, in some ways, provided more direct evidence than Ross.
However, in 1902, the Nobel Prize was awarded only to Ross. Grassi was outraged, and the two men engaged in a fierce dispute over priority for the rest of their lives. Ross argued that he had first identified the key principle, while Grassi countered that the actual demonstration in human malaria was more important.
This is strangely similar to the story of Behring and Kitasato a year earlier. A recurring pattern in early Nobel Prizes: the scientist of the imperial power receives the award, while the scientist from a non-European country or a rival country is overlooked due to structural biases.
A Scientist Who Writes Poetry
Ross had a unique side to him. He was also a serious poet. On the night of August 20, 1897, the day he discovered the malarial parasite, Ross took his eyes away from the microscope and wrote a poem.
"This day, O Lord, did thy hand guide me / To find this great seed of death..."
Medical papers, mathematical models, poems, novels, paintings—Ross was a Renaissance man who excelled in all fields. The mathematical model of malaria that he developed influenced not only the medical community but also the field of applied mathematics, and is considered a pioneering achievement in modern epidemiological modeling.
A War That Has Not Yet Ended
Ross’s discovery led to immediate practical applications. If mosquitoes are the culprit, then eliminating mosquitoes will solve the problem. Improving sanitation, installing mosquito nets, and draining swamps. The construction of the Panama Canal (1904-1914) was possible thanks to Ross’s discovery. The main reason for France’s failure before the construction was due to malaria and yellow fever.
However, even after more than 120 years, malaria still kills more than 600,000 people each year. Most of them are children under the age of five in Africa. As the 2015 Nobel Prize (Tu Youyou, artemisinin) showed, humanity is still fighting this parasite.
One hundred and twenty-five years after Ross dissected mosquitoes in the hot laboratory in India, the attack path has been identified, but the firewall has not yet been completed.