An Australian scientist who has won the 2005 Nobel prize for medicine has said his discovery was 'bloody obvious'.
Robin Warren, who shares the prize with his colleague Barry Marshall, said he was 'thrilled' to be recognised, but had always believed in their work.
The two scientists have described how they were initially shunned for insisting stomach ulcers were caused by a bacterium, not stress.
Mr Marshall finally swallowed the bacterium himself to prove his point.
Mr Warren said he was a "little overcome" by the award.
"It is nice to be officially recognised and it gives some sort of a stamp of approval, but we believed it within a few months because it was so bloody obvious," he told reporters.