The Helicobacter pylori, which causes most stomach ulcers, has been present in humans since more than 60,000 years ago. It is one of the most widely spread microorganisms: some researchers claim that only exceeds it the bacterium that causes tooth decay in number. The ulcer of stomach and duodenum, is an infectious disease whose main cause is a mobile, and spiral bacterium called Helicobacter pylori, which is acquired in childhood and lived for many years in the interior of the gastric cavity. Although always produces a small swelling, most of the time this organism does not produce symptoms and only causes an ulcer in about one in every ten individuals that infects. In this case a combination of antibiotic drugs, is administered to the patient to eliminate the bacterial infection and is restored from its ulceration.
Is not yet known the exact mechanism by which Helicobacter pylori induces the appearance of ulcers, but more recent studies suggest that this can be related to the presence in the duodenum of bacterial strains especially aggressive and capable of producing toxins that can directly injure the superficial cells of the digestive tract. These knowledge that currently are a proven scientific certainty, and have already been incorporated to health systems protocols and manuals of medicine, about two decades ago were considered to be slightly less than a heresy, by a multitude of skeptical experts, who did not believe in the effects of the now called the ulcer bacterium. The presence of spiral bacteria in the human stomach was first described by Kreinitz in 1906, according to the Spanish Association of Gastroenterology (AEG). But it was not until the beginning of the 1980s, when Robin Warren rediscovered the germ and first established its relationship with gastric inflammation and ulcers. Attempts by the researcher Barry Marshall isolate and cultivate the bacterium they were unsuccessful until he left forgotten in his lab a few vials of a biopsy culture during Easter of 1982.