The Doctor Who Drank the Bacteria
The Doctor Who Drank the Bacteria
1981–2005Perth, AustraliaScience & discovery
Told his ulcer research was impossible, an Australian doctor drank a broth of the bacteria to prove it — and gave himself gastritis.
Reading level
The same true story, told at three lengths. Pick one to read, close your eyes, and tell it back in your own words.
216 words · about 1 min to read · retell it in about 2 minutes
For many years, doctors believed stomach ulcers were caused mainly by stress, spicy food, and too much acid.
An Australian doctor named Barry Marshall was not so sure. Together with a pathologist named Robin Warren, he had seen something strange, spiral bacteria living inside the stomach. Most doctors believed no bacteria could survive stomach acid.
In 1982, their lab finally grew the bacteria, almost by accident. The lab was too busy to throw out one sample after two days. By the following Monday, the spiral bacteria had grown in it.
But most doctors did not believe them. The Gastroenterological Society of Australia turned their paper down, rating it in the bottom ten percent. So Marshall did something extreme. He drank a broth containing the bacteria.
In a few days he felt sick and nauseous. His breath turned bad. Tests showed the bacteria had settled in his stomach, and his stomach was inflamed. Then he treated himself with antibiotics, and he recovered.
A tabloid newspaper loved the story. Doctors took longer, but in 1994 a meeting held by America’s National Institutes of Health agreed that the key to treating ulcers was finding and killing the bacteria. In 2005, Marshall and Warren won the Nobel Prize. Today, many ulcers can be cured with a short course of antibiotics.
303 words · about 2 min to read · retell it in about 2 minutes
In the early 1980s, every doctor learned the same story about stomach ulcers: stress, spicy food, and too much acid. The usual treatments could not cure them, and some patients needed surgery.
At Royal Perth Hospital, a young doctor named Barry Marshall met a pathologist named Robin Warren, who kept seeing curved bacteria in stomach samples. Most doctors believed that was impossible, because they thought no bacteria could live in stomach acid.
In 1982, they grew the bacteria in the lab, and only because of a lucky accident. One culture plate was left from Thursday to Monday, because the busy lab had no time to throw it out after two days. H. pylori had grown on it — a germ that simply grows slowly.
Medicine did not celebrate. Their paper was rejected, rated in the bottom ten percent. Marshall later wrote that people disputed the work not on the science, but because they believed it simply could not be true.
After failing to infect animals, he decided to test it on himself. Without asking the ethics committee, and without really asking his wife, he drank a broth of the cultured bacteria. It would be easier, he wrote, to get forgiveness than permission.
Within three days he felt nauseous, and his wife noticed his breath had turned foul. His stomach stopped producing acid. He started vomiting. On day eight, a test showed his stomach inflamed and crawling with the bacteria he had swallowed. Then he treated himself, and recovered.
A newspaper got the story and loved it: guinea-pig doctor discovers new cure for ulcers. Real acceptance took about a decade. In 1994, America’s NIH declared that the key to ulcer treatment was killing H. pylori. In 2005 came the Nobel Prize. And many ulcers became curable with a simple two-week course of antibiotics and bismuth.
457 words · about 2 min to read · retell it in about 4 minutes
Every medical student in the early 1980s learned the same doctrine about peptic ulcers: stress, spicy food, and too much acid. Patients suffered for years, and some faced surgery. Most doctors did not believe bacteria could live in hydrochloric acid.
At Royal Perth Hospital in 1981, Barry Marshall, a trainee physician, met Robin Warren, a pathologist with slides showing curved bacteria in stomach lining. Together they found the organism in nearly every ulcer patient, and proposed the heresy that it caused the disease. The idea was simple, but it fought against everything the profession was sure of.
The first culture succeeded in 1982 through an accident worthy of the story. Lab technicians routinely discarded cultures after two days; one plate sat untouched from Thursday to Monday. On it grew a slow-growing spiral germ later named Helicobacter pylori.
The reception was brutal. The Gastroenterological Society of Australia rated their paper in the bottom ten percent of submissions. Marshall later wrote that his results were disputed not on the basis of science, but because people believed they simply could not be true. Animal experiments failed; he could not infect piglets.
Which left one volunteer. In 1984, Marshall drank a broth of cultured H. pylori. He skipped the ethics committee and, as he later admitted, did not discuss it in detail with his wife; it would be easier, he wrote, to get forgiveness than permission.
The germ won the first round. Within three days he was nauseated, and his breath turned foul; his stomach acid had dropped so far that the bacteria thrived. Days five to eight brought vomiting. An endoscopy on day eight showed his stomach inflamed and the bacteria cultured out of it. On day fourteen he began a course of antibiotics, and he recovered. He had turned his own stomach into the proof.
Warren let the secret slip to a journalist, telling him Marshall had infected himself and damn near died — a slight exaggeration, Marshall later wrote. A tabloid ran it under a headline about a guinea-pig doctor, and the fame machine started before the science did. The medical world took about ten years to catch up. Skepticism this deep is not cured by a single paper. In February 1994, an NIH consensus meeting in Washington declared that the key to ulcer treatment was detecting and eradicating H. pylori. Marshall wrote of waiting a decade for that day, of relief and satisfaction.
In 2005 he and Warren received the Nobel Prize in Physiology or Medicine. Some patients who once faced surgery were cured instead by a two-week course of antibiotics and bismuth. The whole story fits in one sentence: a doctor drank the germ he blamed for ulcers, and proved it could make a healthy stomach sick.
Read it once, close the page, and tell it back. The coach listens for pace, fillers and the facts.
Key facts and sources
Barry Marshall met Robin Warren, a pathologist, at Royal Perth Hospital in 1981.
“He met Dr. Robin Warren, a pathologist interested in gastritis, during internal medicine fellowship training at Royal Perth Hospital in 1981.” — Barry Marshall, Wikipedia
Warren had seen curved bacteria in stomach samples.
“In our first meeting, Robin showed me slides of the curved bacteria he had seen” — Barry J. Marshall – Biographical, NobelPrize.org
The medical doctrine was that ulcers were caused by stress, spicy foods and too much acid.
“challenging decades of medical doctrine holding that ulcers were caused primarily by stress, spicy foods, and too much acid” — Barry Marshall, Wikipedia
It was claimed no bacteria could live in the acidic stomach.
“who did not believe that any bacteria could live in the acidic environment of the stomach” — Barry Marshall, Wikipedia
In 1982 Marshall and Warren performed the first culture of H. pylori.
“In 1982, they performed the initial culture of H. pylori” — Barry Marshall, Wikipedia
The lab technicians threw out cultures after two days; the 31st sample stayed from Thursday to Monday and grew the bacteria.
“it was discovered that the lab technicians had been throwing out the cultures after two days. This was standard practice for throat swabs where other organisms in the mouth rendered cultures unusable after two days. Due to other hospital work, the lab technicians did not have time to immediately throw out the 31st test on the second day, and so it stayed from Thursday through to the following Monday. In that sample, they discovered the presence of H. pylori.” — Barry Marshall, Wikipedia
H. pylori grows more slowly than the conventional two days.
“They later found out that H. pylori grows more slowly than the conventional two days required by other mucosal bacteria” — Barry Marshall, Wikipedia
In 1983 the Gastroenterological Society of Australia reviewers rated their paper in the bottom 10 percent.
“In 1983, they submitted their findings thus far to the Gastroenterological Society of Australia, but the reviewers turned their paper down, rating it in the bottom 10% of those they received that year.” — Barry Marshall, Wikipedia
In 1984, after failed attempts to infect piglets, Marshall drank a broth containing cultured H. pylori.
“After failed attempts to infect piglets in 1984, Marshall had a baseline endoscopy done before drinking a broth containing cultured H. pylori” — Barry Marshall, Wikipedia
He had not discussed it with the ethics committee, nor in detail with his wife Adrienne.
“I didn’t discuss it with the ethics committee at the hospital. More significantly, I didn’t discuss it in detail with Adrienne.” — Barry J. Marshall – Biographical, NobelPrize.org
He said it would be easier to get forgiveness than permission.
“This was one of those occasions when it would be easier to get forgiveness than permission.” — Barry J. Marshall – Biographical, NobelPrize.org
After three days he developed nausea and bad breath, which his wife noticed.
“He was surprised when, in just three days, he began to develop vague nausea and halitosis” — Barry Marshall, Wikipedia
His stomach was not producing enough acid, so the bacteria survived.
“due to the achlorhydria—there was not enough acid to kill bacteria in the stomach” — Barry Marshall, Wikipedia
On days 5 to 8 he developed vomiting.
“On days 5–8, he developed achlorhydric vomiting.” — Barry Marshall, Wikipedia
On day eight an endoscopy showed massive inflammation and the bacteria were cultured from his stomach.
“On day eight, he had another endoscopy, which showed massive inflammation (gastritis), and a biopsy from which H. pylori was cultured” — Barry Marshall, Wikipedia
When he came home with the biopsy results, Adrienne suggested it was time to treat himself.
“When I came home with my biopsy results showing colonization and classic histological damage to my stomach, Adrienne suggested it was time to treat myself.” — Barry J. Marshall – Biographical, NobelPrize.org
He said: I had a successful infection, I had proved my point.
“I had a successful infection, I had proved my point.” — Barry J. Marshall – Biographical, NobelPrize.org
Warren told a journalist that Marshall had infected himself and damn near died.
“Rob blabbed the results of my still unreleased work with “I know because Barry Marshall has just infected himself and damn near died”” — Barry J. Marshall – Biographical, NobelPrize.org
A tabloid ran the headline Guinea-pig doctor discovers new cure for ulcers.
“The next day the story appeared, “Guinea-pig doctor discovers new cure for ulcers … and the cause.”” — Barry J. Marshall – Biographical, NobelPrize.org
The experiment was published in 1985 in the Medical Journal of Australia and is among its most cited articles.
“This experiment was published in 1985 in the Medical Journal of Australia and is among the most cited articles from the journal.” — Barry Marshall, Wikipedia
By the early 1990s acceptance turned; a 1994 NIH consensus statement made H. pylori eradication the key to ulcer treatment.
“In February 1994 the NIH held a consensus meeting in Washington DC which ended after 2 days with the statement to the effect that the key to treatment of duodenal and gastric ulcer was detection and eradication of Helicobacter pylori.” — Barry J. Marshall – Biographical, NobelPrize.org
Marshall said he had been waiting ten years and felt relief and satisfaction.
“I had been waiting for ten years for this day and I felt a combination of relief and satisfaction that I had achieved what I set out to do.” — Barry J. Marshall – Biographical, NobelPrize.org
Antibiotics and bismuth that killed H. pylori cured duodenal ulcers.
“Marshall showed that antibiotic and bismuth salt regimens that killed H. pylori resulted in the cure of duodenal ulcers.” — Barry Marshall, Wikipedia
In 2005 Marshall and Warren won the Nobel Prize for the discovery of H. pylori’s role in gastritis and peptic ulcer disease.
“In 2005, the Karolinska Institute in Stockholm awarded the Nobel Prize in Physiology or Medicine to Marshall and Robin Warren, his long-time collaborator” — Barry Marshall, Wikipedia
Ulcers can now be cured with a short course of antibiotics rather than a lifetime of acid drugs.
“Some of my patients had postponed surgery which became unnecessary after a simple 2 week course of antibiotics and bismuth.” — Barry J. Marshall – Biographical, NobelPrize.org
He wrote that doctors disputed the work not on science but because they believed it could not be true.
“my results were disputed and disbelieved, not on the basis of science but because they simply could not be true.” — Barry J. Marshall – Biographical, NobelPrize.org
Marshall and Warren found the bacteria in almost all patients with gastritis or ulcers.
“discovered spiral bacteria in the stomachs of almost all patients with active chronic gastritis, or duodenal or gastric ulcers” — Barry Marshall, Wikipedia
On the fourteenth day after ingestion, Marshall began taking antibiotics.
“On the fourteenth day after ingestion, a third endoscopy was done, and Marshall began to take antibiotics.” — Barry Marshall, Wikipedia
Sources consulted for this story: Barry Marshall (Wikipedia, accessed 2026-10-25); Barry J. Marshall – Biographical (NobelPrize.org, accessed 2026-10-25). Every story is checked against its sources before it is published — how we verify stories.
Why this story is worth telling
A lucky accident, a rejected paper and one shocking experiment beat the textbooks.
