The French doctor who accidentally discovered that copper kept cholera away

Paris, early 1850s. The city is being ravaged by cholera outbreaks claiming thousands of lives, a disease doctors at the time didn't yet understand, let alone know how to prevent. Amid that fear, a French doctor named Victor Burq notices something no one else had, something so strange he would spend more than fifteen years of his life trying to explain it.

In short

• During the cholera outbreaks of 1832, 1849 and 1852, the roughly 200 workers at a Paris copper smelter stayed almost entirely healthy.
• Burq saw that same protection among 400 to 500 copperworkers further down the same street.
• During the 1854-1855 epidemic, he found not a single death among jewellers, goldsmiths and tinkers.
• Burq visited more than 400 businesses and gathered data on over 200,000 people across four countries.
• In 1867 he presented his findings to the French Academies.
• A century and a half later, the US EPA officially recognises copper alloys as an antimicrobial material.

A strange silence in the death tolls

Burq studied the hospital registers of the cholera outbreaks of 1832, 1849 and 1852 and stumbled upon something striking. At a copper smelter in the third arrondissement of Paris, a factory that, according to his own notes, was in poor condition and where hygiene left much to be desired, the roughly two hundred men working there had been almost entirely spared during all those outbreaks. He saw the same pattern among the four hundred to five hundred copperworkers working further down the same street. While the disease raged around them, the people who worked with copper in their hands all day remained strikingly unaffected, despite otherwise far from healthy working conditions.

During the severe epidemic of 1854 and 1855, Burq went a step further. He specifically searched for deaths among jewellers, goldsmiths and tinkers in the city, professions in which people handled copper and copper alloys daily. He didn't find a single one.

A fifteen-year investigation

For Burq, this was no longer coincidence, but a pattern that deserved an explanation. He set out on what would eventually become one of the most extensive medical field studies of his time. He visited more than four hundred businesses in Paris, compared the health of workers who did and didn't come into contact with copper, and eventually gathered data on more than two hundred thousand people, not only in France, but also in England, Sweden and Russia.

Again and again, he saw the same picture: people who worked with copper professionally were strikingly often spared during cholera outbreaks. By 1867, Burq was confident enough to present his findings to the French Academies, the highest scientific forum France had at the time. His conclusion: copper and copper alloys on the skin appeared to protect people against cholera.

Ahead of his time

What Burq couldn't have known at the time is exactly what laboratories would be able to demonstrate a century and a half later. Copper on surfaces genuinely proves capable of rendering bacteria and viruses harmless within a few hours, a property so well documented today that the US EPA officially recognises copper alloys as an antimicrobial material. You can read exactly how that mechanism works, from that EPA recognition to laboratory research at the University of Southampton, in our article Can copper really kill bacteria? The evidence, from the EPA to Southampton, which explains the mechanism behind Burq's nineteenth-century observations.

Burq drew his conclusions with the tools of his time: no microscopes to see viruses, no controlled laboratory trials as we know them now, but sharp observation and persistent fieldwork. Historians have since critically examined his methodology, as science should. But the core of what he saw is confirmed time and again in modern research on copper and cholera.

From copper smelter to your daily life

Burq's story shows how often great discoveries begin with a simple observation: someone noticing that something is going differently than expected, and being curious enough to dig deeper. From a Paris copper smelter in 1852 to the copper products you can bring into your home today runs a straight line of that same fascination with what this metal can do.

Curious about the properties Burq already suspected back then? Discover Kopero's copper water bottle, or browse the full collection of copper products with those same protective properties.