# Ignaz Semmelweis introduces chlorine handwash on the Vienna obstetric ward Date: 1847 ## The fact In May 1847 Ignaz Semmelweis ordered chlorine handwash for physicians moving from autopsies to the First Obstetric Clinic in Vienna. Maternal mortality on that ward fell. The protocol is a completed hospital order. Hippocratic-Galenic colleagues rejected the explanation. Their rejection is context. It is not a reason to deny the mortality drop. ## Context Puerperal fever was still narrated in miasma and humour language. Semmelweis had no germ theory. He had a ward comparison. The school that claimed Hippocratic observation as its ancestor refused this observation. That irony is historical, not a cartoon of Cos. Later Lister and WHO hand-hygiene campaigns are descendants, not this order. [Hippocrates](/people/hippocrates) of Cos is not the sole author of every Greek medical treatise later copied under his name, and he is not the signer of every later oath or code that quoted him. Shared work with unnamed Coan practitioners, Alexandrian compilers, Galen, Latin printers, medical faculties, and twentieth-century medical associations does not erase the Cos identity Plato used, and it does not make a fifth-century physician the author of the 1948 Declaration of Geneva. ## Evidence and sources NLM’s Semmelweis exhibition documents the 1847 order and mortality change. WHO’s later hand-hygiene campaign independently shows the institutional afterlife. They are different instruments. Official or archival record: NLM — Dr. Ignaz Semmelweis (https://www.nlm.nih.gov/exhibition/semmelweis/index.html; U.S. National Library of Medicine). ## Significance Improving transmission path. High confidence on the Vienna ward comparison. Complex contribution: the tradition being displaced is the Hippocratic-humoral obstetric establishment. This improving Fact exists because the worsening humoral refusal is real. A later Semmelweis-death-in-asylum row would be a different date. A printed corpus does not vaccinate a child. An oath does not staff a clinic. ## What is established and what is not Established: Semmelweis introduced chlorine wash in 1847 and mortality fell on that ward. Not established: that Hippocrates forbade handwash, or that 1847 Vienna changed world maternal mortality that year. What would change the picture: a contradictory autograph, a securely dated Coan inscription naming a different author, or a measured series that can be argued, with lag and alternatives, as a consequence of this instrument rather than of later institutions acting in his name. The documentary trail can name an office, printer, code, trial, or treatise heading; it cannot name a complete Coan patient register. Confidence belongs on the impact path. Estimates of later harm from humoral treatment, where historians publish them, are attributed to those historians, not invented here. A Cos vita, a medieval oath manuscript, a Venetian folio, and a twentieth-century medical-association code are different instruments even when they share a heading. Hippocrates’ contribution, where it exists, is the name and the later use of treatises grouped under that name, not a modern ministry signature. Sharing labour with printers, editors, prosecutors, or assemblies is not a reason to drop the row and not a reason to treat the row as a clinical trial. Readers who want a birth certificate, a patient register, or a unique coefficient onto a modern indicator will not find those things in this instrument, and the page should not pretend otherwise. The date is the date of this instrument, not a licence to back-date every later harm or benefit to Cos in the fifth century BCE. If a number of deaths, doses, or pupils is not in the official or independent record named above, it is not supplied here. ## People - Hippocrates: https://factrail.ai/people/hippocrates ## Drivers - Infectious-Disease Transmission: https://factrail.ai/drivers/infectious-disease-transmission ## Sources - https://www.who.int/campaigns/world-hand-hygiene-day - https://www.nlm.nih.gov/exhibition/semmelweis/index.html ## Methodology https://factrail.ai/methodology Canonical: https://factrail.ai/facts/at-semmelweis-childbed-fever-1847