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Marshall and Warren
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What scientific principle did Marshall demonstrate by infecting himself?
Self-experimentation / proving causation
Why was it difficult to grow H. pylori at first?
It grew very slowly / needed the right conditions
What key scientific idea did their work challenge?
That ulcers were caused by stress and lifestyle, not bacteria
In what year did Marshall and Warren win the Nobel Prize?
2005
Name one method Marshall & Warren used to identify H. pylori.
Biopsy, staining, or culture
Which part of the digestive system is affected in a gastric ulcer?
The stomach
What treatment did Marshall & Warren prove works for ulcers?
Antibiotics
Why didn’t scientists believe their idea at first?
They thought stomach acid killed all bacteria
What did Marshall develop after drinking the bacteria?
Gastritis symptoms / stomach inflammation
Who was Marshall’s scientific partner?
Robin Warren
What shape is H. pylori?
Spiral-shaped
Where in the body does H. pylori live?
The stomach
Which scientist drank the bacteria to prove his hypothesis?
Barry Marshall
True or False: Stress is the main cause of peptic ulcers.
False
What bacteria did Marshall and Warren discover causes most stomach ulcers?
H. pylori
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