Louis Pasteur Administers First Rabies Vaccine to Human

Context

By the mid-1880s Louis Pasteur had already transformed microbiology through his studies of fermentation and infectious disease. Building on successful attenuation techniques used for chicken cholera and anthrax, he turned his attention to rabies, a disease transmitted by animal bites whose microbial cause remained invisible under ordinary microscopes. Working with rabbits, Pasteur discovered that drying sections of infected spinal cord progressively weakened the virus while preserving its ability to stimulate immunity when injected into animals.

What Happened

In early July 1885 nine-year-old Joseph Meister arrived in Paris from Alsace after suffering multiple bites from a rabid dog. His mother sought out Pasteur, whose animal experiments had become known. Pasteur, reluctant to test an unproven preparation on a human, consulted his colleagues. Émile Roux expressed strong reservations, but physician Jacques-Joseph Grancher argued forcefully that the boy’s prognosis was otherwise hopeless and urged proceeding with the treatment developed in the laboratory.

Aftermath

Grancher administered the first of a series of daily injections prepared from dried rabbit spinal cords containing virus of decreasing virulence. Meister tolerated the regimen without developing rabies and recovered fully. News of the outcome traveled quickly, drawing additional patients to Pasteur’s laboratory and prompting the rapid organization of a dedicated anti-rabies service.

Legacy

The 1885 success demonstrated that post-exposure immunization could prevent an otherwise fatal disease and provided concrete evidence for the practical value of germ theory. It directly inspired the founding of the Institut Pasteur in 1888 and shaped the development of modern rabies post-exposure prophylaxis, while establishing the broader principle that laboratory-attenuated pathogens could safely confer immunity in humans.