# Pasteur’s public Pouilly-le-Fort report leaves the bichromate attenuation actually used off-stage

Date: 1881

## The fact

In June 1881 [Louis Pasteur](/people/louis-pasteur) reported the Pouilly-le-Fort anthrax trial to the Académie as a success of vaccination by attenuated anthrax. Later inspection of laboratory notebooks, especially as published in Gerald Geison’s study, indicates that the farm animals received a potassium-bichromate vaccine closer to Toussaint’s chemical path than the oxygen-attenuation story told in public. No French court entered a fraud judgment. The row stays contested laboratory secrecy, not a verdict of crime.

## Context

Priority fights with Toussaint and the need to stage a press-visible miracle rewarded a clean story. Roux and Chamberland’s notebooks are part of the file. Sharing the bench does not erase Pasteur’s public voice. Geison (1995) is a historian, not a contemporary prosecutor. This dossier records the controversy as controversy. Do not collapse the public trial outcome and the method dispute into one Fact.

Confidence is stated on the impact path, not hidden in adjectives. Mixed effects of Pasteur’s public Pouilly-le-Fort report leaves the bichromate attenuation actually used off-stage are separate paths.

## Evidence and sources

Institut Pasteur history at https://www.pasteur.fr/en/institut-pasteur/history still presents Pouilly-le-Fort as a public vaccine success, the official career story. Princeton’s page for Geison, The Private Science of Louis Pasteur, at https://press.princeton.edu/books/paperback/9780691015521/the-private-science-of-louis-pasteur is the independent carrier of the notebook critique. The URLs differ. No number of ‘fraudulent sheep’ is supplied here.

Official or archival record: Institut Pasteur — History (https://www.pasteur.fr/en/institut-pasteur/history; Institut Pasteur).

## Significance

[Institutional-corruption](/drivers/institutional-corruption) path as secrecy and public-method mismatch, medium confidence, not a criminal count. The welfare sign is worsening on transparency, while the same week’s survival contrast remains an improving infect path on another row.

The attached driver is institutional-corruption. The welfare reading used in this dossier is worsening. That reading is an impact-path choice, not a property stored on the Fact itself.

## What is established and what is not

Established: Pasteur’s public June 1881 account and a later scholarly claim of a different laboratory preparation both exist. Not established: a judicial finding of fraud, or that the animals did not show the public survival contrast. Geison — The Private Science of Louis Pasteur” at https://press.princeton.edu/books/paperback/9780691015521/the-private-science-of-louis-pasteur. Contribution is recorded as He signed the public story of oxygen attenuation. Notebooks and later historians describe potassium-bichromate preparation. Contested, not a criminal judgment. The impact note is A gap between public method and laboratory practice is an institutional-secrecy path, stored as contested rather than as adjudicated fraud. The dated heading stays Pasteur’s public Pouilly-le-Fort report leaves the bichromate attenuation actually used off-stage on 1881-06-13, not a later statue, UNESCO listing, or school film. Printers, unnamed clerks, and later editors may appear in the same file without becoming this instrument.

Shared responsibility is part of Pasteur’s public Pouilly-le-Fort report leaves the bichromate attenuation actually used off-stage. Naming Louis Pasteur does not delete co-authors, institutions, or later transmitters. The lag from 1881-06-13 to any measured indicator is not treated as zero. Alternative explanations — weather, other armies, later statutes, or independent cultural change — remain live where the sources do not close them.

If a number is not in the two records named above, it is not supplied here.

Later competitions, monuments, translations, UNESCO listings, museums, and adaptations are not converted into extra lifetime acts.

## People

- Louis Pasteur: https://factrail.ai/people/louis-pasteur

## Drivers

- Institutional Corruption: https://factrail.ai/drivers/institutional-corruption

## Sources

- https://press.princeton.edu/books/paperback/9780691015521/the-private-science-of-louis-pasteur
- https://www.pasteur.fr/en/institut-pasteur/history

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/pasteur-pouilly-method-1881