Explore the recorded discovery and history of Helicobacter pylori, with source links and stated limits.
H. pylori is a curved or spiral bacterium that colonizes the mucus lining the human stomach. Infection may cause no noticeable symptoms. Persistent infection can cause stomach inflammation and peptic ulcers, and increases the risk of certain gastric cancers. Ulcer symptoms overlap with other conditions and do not establish H. pylori infection.
The ASM bacteriology chapter records Marshall’s culture of the organism in 1982. The 1985 and 1989 events below concern nomenclature, not the first infected person or biological origin.
LPSN records the earlier Campylobacter pylori name with Marshall and colleagues’ 1985 authority. This is a naming milestone, not a first infection.
Goodwin and colleagues transfer the species to the Helicobacter genus in 1989.
These references do not establish the first human infection. Naming, isolation and recognition milestones do not date biological origin or patient zero.
Source check: 2026-09-19. Educational content; independent scientific review remains pending.