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Veterinarians and Animal Scientists

Louis Pasteur and Pouilly-le-Fort: The 1881 Trial That Put Anthrax on Trial

In May 1881 a crowd watched on a farm near Paris as Louis Pasteur tried to prove that vaccinated livestock could survive anthrax.

What did Louis Pasteur do for cattle and sheep?

Louis Pasteur (1822 to 1895) was a French scientist whose most famous livestock experiment took place in 1881 at Pouilly-le-Fort, on a farm near Paris. The test was designed to show that an anthrax vaccine protected sheep and cattle. Anthrax was a heavy cost for livestock owners, and a vaccine promised a way to manage it.

Because evidence for the trial rests largely on one detailed modern account, this profile is marked thin and adds context where documented personal detail is limited. The core facts here come from a VaccinesWork article from Gavi.

How the chicken cholera accident set the stage

Pasteur's team first achieved attenuation, the weakening of a disease agent, in 1879 by accident, using chicken cholera bacteria that had been exposed to air. The idea that a weakened germ could protect rather than kill carried over to anthrax.

For anthrax, the researchers found that exposing the bacteria to heat and oxygen during growth reduced virulence. Pasteur's collaborators Charles Chamberland and Emile Roux worked with him, and Chamberland is reported to have developed the working formula.

Setting up the Pouilly-le-Fort trial

In April 1881 a trial protocol was submitted to the Agricultural Society of Melun for approval, which meant the methods were open to critique before a single animal was treated. Hippolyte Rossignol, a veterinarian and the farm's owner, supplied the venue, selected the animals and observed them. He was also a skeptic of germ theory.

The animals totaled 70: 58 sheep, 2 goats, 8 cows, 1 ox and 1 bull. All had been confirmed as never exposed to anthrax.

What happened in May and June 1881

The trial began on 5 May 1881 with hundreds of spectators, including politicians, journalists, farmers, military physicians, local doctors and veterinarians. After the first day Pasteur spoke to the crowd in a plain tone and, as the article's authors put it, charmed his audience. At the end of the month the animals were exposed to virulent anthrax.

On 2 June Pasteur received a telegram from Rossignol with the results. Vaccinated animals survived and stayed healthy. Unvaccinated goats and sheep all died, while unvaccinated cattle survived but developed large swellings at the exposure site. The ranching angle is covered in the ranching section of farm.FM.

A rivalry and a later surprise

Jean-Joseph Henri Toussaint, a rival scientist, had pioneered a chemically inactivated vaccine but never achieved consistent results. Pasteur's trial succeeded publicly where Toussaint's work had not.

The audience assumed the vaccine used at Pouilly-le-Fort was live and attenuated. Pasteur's private notebooks, published in the 1970s, revealed it had actually been chemically inactivated. The record is a reminder that public demonstrations and laboratory practice do not always match.

Why It Mattered

News of the trial reached Edinburgh and Birmingham within days and North American papers in August and September 1881. Within weeks, tens of thousands of sheep, cattle and horses were vaccinated, and anthrax mortality in France dropped sharply.

The trial also showed how to win trust. It was announced in advance, observed by skeptics and settled with a clear result.

  • He submitted the trial protocol to the Agricultural Society of Melun, so critics could examine the plan.
  • He let a skeptical veterinarian, Rossignol, choose the animals and observe them.
  • He used unvaccinated control animals, so the contrast between survivors and deaths was visible.
  • He worked with Chamberland and Roux, sharing the technical load of making a working vaccine.
  • He spoke plainly to a large crowd of farmers, officials and journalists, helping adoption spread.

Legacy and further reading

By 1894 an estimated 3.4 million animals had been vaccinated, according to the article's account. That figure is reported rather than audited, but it shows the scale of uptake in farm country.

For a biography of the scientist, see the Science History Institute biography. Readers on farm.FM may enjoy a farm.FM story about vaccines and cattle. The Wikipedia article on Pasteur covers the rest of his career. Cattle people owe a debt to this trial, though claims about its life-saving effects should be read with the caveats noted above.

Timeline

  1. 1822Louis Pasteur is born in the Jura region of France
  2. 1879Team achieves attenuation by accident with chicken cholera bacteria
  3. 1881Protocol submitted to the Agricultural Society of Melun in April
  4. 1881Pouilly-le-Fort trial begins on 5 May
  5. 1881Results telegraphed to Pasteur on 2 June
  6. 1894Estimated 3.4 million animals vaccinated
  7. 1895Pasteur dies

Frequently asked questions

What was the Pouilly-le-Fort experiment?

It was a public trial in 1881 near Paris where Pasteur tested an anthrax vaccine on 70 farm animals, including 58 sheep. Vaccinated animals survived and unvaccinated sheep and goats died.

How many animals were in Pasteur's anthrax trial?

The trial used 58 sheep, 2 goats, 8 cows, 1 ox and 1 bull, 70 animals in all, none of which had been exposed to anthrax before.

Who helped Pasteur with the anthrax vaccine?

Charles Chamberland and Emile Roux were his collaborators, and Hippolyte Rossignol, a veterinarian and farm owner, hosted the trial and observed the animals.

Was the vaccine live or inactivated?

The audience assumed live attenuated, but Pasteur's private notebooks, published in the 1970s, showed the vaccine used at Pouilly-le-Fort was chemically inactivated.

Sources and further reading

Profiles are compiled from public sources and reviewed against them. See our editorial policy to suggest a correction.

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