In August of 1951, in the French village of Pont-Sant-Esprit, bakers received several loads of flour. It had a greyish cast, and smelled a little off. The government depot in charge of distribution ordered them to use it anyway. By August 11, customers complained of feeling ill after eating the bread, and other bakers reported trouble getting their dough to behave properly. Multiple complaints about the flour fell on deaf ears, even though, as it later proved, more bakers in other villages complained about the products of that one specific mill. On August 17, the first local people began to suffer hallucinations. Their feet burned as if they walked on coals. Physicians had no idea what was wrong, until someone realized: St. Anthony’s Fire had struck for the first time in hundreds of years.
Ergot poisoning, or St. Anthony’s Fire, was a disease that afflicted people who ate wheat or rye contaminated by the fungus ergot. In mild cases, people get queasy, sweat a lot, have low blood pressure and a weak pulse, feel elated or giddy despite their illness, and smell like dead mice or other unpleasant things. Severe cases include terrifying nightmare hallucinations that include compulsions, terrible burning pain and swelling in the extremeties, and nerve damage or gangrene. People may kill themselves trying to escape what chases them, or die of other causes. In the French case, four people died and three hundred fell very ill.
In Schwabische Hall, I saw a painting of St. Anthony that showed people approaching him for aid with flaming feet. I’d never seen that in art before, and have not seen it since. The museum did not allow photography and did not sell postcards with that painting on them, alas.
Below is a more common painting of St. Anthony, although the style is rather different than most Renaissance paintings. (H. Bosch aside.)

A detail from the “Temptation of St. Anthony” by Mathias Gruenewald, part of the Eisenheim Altarpiece. The little demon in the corner is a victim of severe ergotism and has gangrene.
The bureaucrats in the French government, which oversaw the distribution of flour, refused to take the blame for forcing the bakers to use contaminated flour. Instead they punished the bakers for selling bad bread. The book The Day of St. Anthony’s Fire by John G. Fuller tells the tale. It is an excellent book that uses interviews, accounts written by the people of the time, court and other testimony and a little imagination in places to describe the events. I happened to find a copy as I was cleaning a corner of a bookshelf this past weekend. My parents got it out of curiosity, because medical history fascinates them. I read it as a young teen, and it left an impression. It’s a great read, if depressing because it doesn’t have a happy ending.
That lack is probably where my distrust of bureaucracies came from, even before personal experience confirmed my suspicion that large governmental or corporate entities are not necessarily your friend. Granted, the post-war French government wasn’t exactly in great shape itself, and that year had not been good for wheat in France and surrounding countries because of the wet weather and cool temperatures. Looking back, I can sort of understand why the central flour depot’s managers might have been reluctant to try to see what was going on. The miller and one wheat grower later confessed that they had broken the law by selling and accepting dirty grain that had rye, bugs, and dirt greater than the official limits. But still, there’s a sense in the book that justice was not done for the bakers or their customers.
Some people disagreed that ergot caused the outbreak. Theories range from mercury-treated wheat that should have been used only for seed, other chemicals that were used to bleach the wheat, the US government conducting tests on using LSD as a weapon [who needs the Internet to have a conspiracy theory?], or something else. The symptoms matched ergot, the weather fit ergot, and most people agree that ergot probably was the culprit.
I’d not thought of the book for a very long time, but I still remember the story.
(Interestingly, in Italy, St. Anthony’s Fire is the term for shingles. The emphasis is on the burning pain and risk of infection, not the hallucinations.)