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Jonas Salk
1914–1995 · Virologist and Medical Researcher
An American physician and virologist who led the development of the first widely used effective polio vaccine, based on inactivated poliovirus.
“Hope lies in dreams, in imagination and in the courage of those who dare to make dreams into reality.”
Why is this scientist famous?
Leading the development of an effective inactivated-poliovirus vaccine that was declared safe and effective after the enormous 1954 field trial.
Salk led the development of the first widely used effective inactivated polio vaccine. No patent was filed on the vaccine, and both Salk's vaccine and Albert Sabin's later oral vaccine became important tools in the global campaign against polio.
Jonas's story
A World Terrified by Polio
In the first half of the 20th century, polio was one of the most feared diseases in the world. It struck mostly children, paralysing limbs and destroying the ability to breathe. In the United States alone, outbreaks infected tens of thousands each summer, leaving children in iron lung machines and parents in a state of dread. Jonas Salk was born in New York in 1914, the son of Jewish immigrants from Russia who had barely a grade-school education. He was the first in his family to go to college, and he grew up in a world where polio was an ever-present terror.
A New Kind of Vaccine
Salk studied medicine at New York University and became fascinated with virology. At the University of Pittsburgh, he began working on a polio vaccine. The approach was controversial because many researchers favoured vaccines made with live, weakened virus. Salk and his research team instead pursued an inactivated-virus vaccine. He killed the virus with formaldehyde so it could not cause infection but still triggered the immune system to build protection.
The Largest Trial in History
In 1954, Salk's vaccine was tested in the largest clinical trial ever conducted, involving roughly 1.8 million children, including vaccinated children, placebo recipients and observed controls — an unprecedented scale of public participation. Parents volunteered their children by the millions, desperate for an end to the terror. The trial was overseen by Dr. Thomas Francis of the University of Michigan, and on 12 April 1955 — ten years to the day after the death of President Roosevelt, who had himself been paralysed by polio — the results were announced: the vaccine was safe and effective. The news sparked nationwide celebration, with church bells ringing and factory whistles blowing across the country.
No Vaccine Patent
No patent was filed on the Salk polio vaccine. When television journalist Edward R. Murrow asked who owned the patent, Salk replied: 'Well, the people, I would say. There is no patent. Could you patent the sun?' The vaccine programme had been supported heavily by public donations through the National Foundation for Infantile Paralysis, later known as the March of Dimes. Salk did not personally receive vaccine patent royalties. Within years, polio cases in the United States dropped by over 90 per cent. Sabin's oral vaccine later joined it in the global effort, and together the two vaccines brought polio to the brink of extinction. Salk began establishing a new research centre in La Jolla in 1960. The Salk Institute for Biological Studies opened in 1963. Decades later, he investigated the possibility of an HIV/AIDS vaccine.
What did they discover?
Killed-Virus Polio Vaccine
Led a research team that developed an effective vaccine using formaldehyde-inactivated poliovirus. Earlier discoveries by many other researchers, including methods for growing poliovirus in tissue culture, were essential to making polio vaccines possible.
The 1954 Field Trial
The vaccine was evaluated in a huge 1954 field trial directed by Thomas Francis Jr., involving roughly 1.8 million children as vaccinated participants, placebo recipients or observed controls.
The Salk Institute
Founded the Salk Institute for Biological Studies in 1960; its permanent campus in La Jolla opened in the 1960s.
Unpatented Vaccine
No patent was filed on the polio vaccine, and Salk received no personal patent royalties from it.
Amazing facts
When asked who owned the vaccine patent, Salk famously replied, 'Well, the people, I would say. There is no patent. Could you patent the sun?'
He was the first member of his family to go to college; his parents were Jewish immigrants from Russia with barely a grade-school education.
The 1954 vaccine trial involved 1.8 million children — the largest clinical trial in history at the time.
The results were announced on 12 April 1955, exactly ten years after the death of President Roosevelt, who had been paralysed by polio himself.
Church bells rang and factory whistles blew across America when the vaccine was declared safe and effective.
Albert Sabin later developed a widely used oral vaccine made with weakened live poliovirus. Both vaccines became important in global polio control.
He spent the last years of his life searching for a vaccine against AIDS, a quest he did not live to see completed.
The Salk Institute he founded in La Jolla has produced six Nobel laureates and remains one of the world's top biological research centres.
Timeline
Born in New York City, son of Russian Jewish immigrants
Earned his medical degree from New York University
Joined the University of Pittsburgh to research polio
Reported promising early results from tests of an inactivated-poliovirus vaccine
Launched the largest clinical trial in history with 1.8 million children
Vaccine declared safe and effective on 12 April — nationwide celebration
Founded the Salk Institute for Biological Studies
Died in La Jolla, California, age 80
Began research aimed at developing approaches to HIV/AIDS
Awards & honours
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