A doctor discovered that washing hands saves lives – but nobody wanted to believe him

In the mid-19th century, the Viennese obstetrician Ignaz Semmelweis realized that many fatal postpartum infections in women were transmitted by the doctors themselves, because they went to their patients unwashed after performing surgeries on corpses. With rigorous handwashing, mortality dropped drastically. But many of his colleagues refused to accept this—for had Semmelweis been right, they would have been unintentionally responsible for the deaths of countless people. Semmelweis was ostracized, and his findings were ignored for a long time. He died in 1865 under circumstances that remain controversial and not conclusively clarified to this day. It was only a generation of doctors later that handwashing became established.

It is one of the bitterest stories in medical history. In 1847, a young assistant physician at the General Hospital of Vienna discovers why young mothers are dying in droves in his ward. He orders doctors and students to disinfect their hands before every examination. Within a few months, the mortality rate plummets. It is arguably the greatest success of Viennese medicine in those years – yet almost no one recognized it. Instead of appreciation, Semmelweis reaps ridicule, loses his position, leaves Vienna, becomes radicalized in his tone, ends up in an asylum, and dies there at the age of 47, of all things from blood poisoning. Only a generation of doctors later is he proven right.

In the 19th century, up to 15% of all women died from infections following childbirth

In 1846, Ignaz Philipp Semmelweis, born in Hungary in 1818, begins his service as an assistant at the First Obstetrical Clinic of the Vienna General Hospital. At that time, between five and 15 percent of all women die after childbirth from childbed fever, a severe postpartum wound infection. In some clinics, as many as 30 percent even die.

Semmelweis notices something: significantly more women die in the First Obstetrical Clinic, where doctors and medical students are trained, than in the Second. Midwives are trained there. The difference is so glaring, that pregnant women fear the medical department and beg to be admitted to the other one.

The explanations of time: bad air and milk congestion

19th-century medicine has a whole range of explanations for dying: among other things, the causes include the bad air of the big city or a blocked milk duct in the breasts of mothers. Behind that is the then-dominant miasma theory: disease arises from spoiled air, bad environmental conditions, and other external circumstances. At any rate, it does not arise from something that one carries on one's own hands from one room to the next.

Ignaz Semmelweis is not satisfied with this. On behalf of the pathologists Carl Rokitansky and Jakob Kolletschka does he perform autopsies on the bodies of the deceased women in childbed and always finds the same finding. He compares mortality figures and looks for a difference between the two departments. In doing so, he comes across something that the medical community does not want to hear from the very beginning.

Doctors treated pregnant women without washing their hands first

In 1847, Jakob Kolletschka dies. He injured his hand with a scalpel during an autopsy. When Semmelweis reads the autopsy report, he realizes: Kolletschka exhibits the exact same symptoms like the women he himself dissected for weeks.

For Semmelweis, this makes it clear: Childbed fever is not a mysterious epidemic, but rather a wound infection transmitted from the outside. Doctors and medical students come straight from the dissection room to the delivery room, examine the women with unwashed hands, and in doing so introduce something into open wounds that Semmelweis, for lack of better knowledge, calls „cadaver particles.“ The midwifery students in the second clinic do not dissect – that is why fewer women die among them.

Semmelweis mandates consistent handwashing—mortality drops to 2-3%

Ignaz Semmelweis orders that everyone who deals with pregnant women must disinfect their hands and instruments beforehand – first with a chlorine solution, later with the cheaper aqueous chlorinated lime solution. The result is clear: The mortality rate drops from 12.3 to two to three percent within a few months.

When twelve more women suddenly fall ill after childbirth anyway, Semmelweis draws the next conclusion: The infection can not only from corpses, but also from living patients going out. He expands the disinfection. He does not know what exactly he is killing there—bacteria are still unknown at this time. But he knows that something is there.

That is the actual methodological leap. Semmelweis does not argue with authority, but with data. His Study from 1847/48 is considered today the first practical case of evidence-based medicine in Austria - and he himself as one of the Fathers of this way of thinking at all.

Doctors refuse to accept that they themselves are responsible for the high mortality rate

And this is precisely where the misconception this story is about begins. Because what Semmelweis's colleagues hear is not: ‘Here is a method that saves lives.„ What they hear is: “You are the cause of death.„ The doctors refused to accept that they, of all people, could be responsible for the women's deaths.. In the 19th century, a doctor was a scholar, a benefactor. That death clung to his hands was an insult.

Add to that: Semmelweis's findings did not fit into any recognized medical theory. Hygiene was considered a waste of time and incompatible with prevailing theories on the causes of disease. Only a few colleagues stood behind him, among them Ferdinand von Hebra, Joseph Škoda, and Carl von Rokitansky. The majority did what institutions do when a new insight challenges them: they made the messenger the problem.

Semmelweis was even accused of, to engage in denunciation through the collection and publication of its statistics. 

Ignaz Semmelweis is expelled from Vienna

In March 1849, Semmelweis's contract is not renewed. The Imperial and Royal Society of Physicians resolves to establish a commission to examine Semmelweis's theses. However following an intervention by his superior Johann Klein, the ministry rejects the review. So the thesis was not refuted. It was prevented from being tested at all.

Finally, in 1850, Semmelweis receives his teaching authorization – but only as a privatdozent for theoretical obstetrics, without demonstrations on corpses, limited to exercises on the phantom. A man who had found the cause of a mass death was only allowed to teach using dolls. Five days after his appointment, he leaves Vienna for Pest, present-day Hungary.

Semmelweis declares doctors murderers “before God and the world”

There he becomes professor of obstetrics at the University of Pest and drastically reduces maternal mortality once again. Convinced of his method, he writes open letters to Europe's leading obstetricians. But he writes them in an arrogant tone that ends any debate: Thus, in 1861, he addresses the Würzburg privy councilor Wilhelm Scanzoni von Lichtenfels „before God and the world as a murderer“.

One can blame Semmelweis for this arrogance as a mistake. But one can also read it as the reaction of a man who had watched women die for a decade and a half from a cause that he had named long ago.

In 1865, Ignaz Semmelweis dies under circumstances that remain unexplained to this day.

People in his circle observed signs of increasing mental confusion in Ignaz Semmelweis. This went so far that in July 1865 Admitted to the Döbling State Mental Hospital near Vienna without a diagnosis from three fellow doctors was. What he actually suffered from remains unclear to this day. Some sources suggest a Plot others severe depression, while still others consider early-stage dementia possible.

Two weeks later, on August 13, 1865, he was dead. He died at only 47 years of age. The autopsy report lists the cause of death as Sepsis – blood poisoning, that is, the very dying he had fought against his entire life. Where the infection came from remains controversial to this day: reports from the time speak of a cut he inflicted on himself, Other accounts of a confrontation with the facility staff.

One finding makes the official version at least questionable. In the Exhumation in 1963 revealed multiple fractures in the arms, hands, and left chest. Nothing can be proven from this. But the idea that the discoverer of hand hygiene died of a wound infection he contracted in an institution to which he had been brought without a diagnosis is difficult to bear, even without a conspiracy.

The Semmelweis Reflex: When institutions reflexively reject new insights

The late punchline of this story is that his name stands for a phenomenon today. As Semmelweis reflex refers to the tendency of the establishment to reflexively reject a new finding without sufficient examination. The originator is often fought rather than supported—if their thesis contradicts prevailing norms and beliefs. The term was coined by US author Robert Anton Wilson.

However, the term does not mean that skepticism is fundamentally wrong. On the contrary, skepticism is an inherent part of scientific work. In Semmelweis's case, the problem was not that his colleagues were critical. Rather, they refused to conduct an unbiased examination of his results. His data was not refuted—it was not even seriously examined in the first place.

Precisely for this reason, the term is used today beyond medicine as well. It describes situations in which institutions or professional communities reject new findings because their consequences would challenge their own self-image, established procedures, or existing beliefs.

To this day, hand hygiene is the most effective measure for preventing hospital-acquired infections.

Scientific confirmation for his theses came long after Semmelweis was dead. Louis Pasteur and Robert Koch proved bacteriologically, which he had only observed; a generation of doctors later, hygiene measures became established in childbed. Today, the Budapest University of Medicine bears his name, and the Medical University of Vienna unveiled a bust in 2019 – its rector said at the time, Today Semmelweis would certainly be a favorite for the Nobel Prize.

And the actual message of his story remains relevant to this day. The World Health Organization has declared May 5th as World Hand Hygiene Day. The date is symbolic of the five fingers on a hand. Proper hand hygiene is still considered one of the simplest and most effective measures to prevent hospital-acquired infections.

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