The signs and symptoms of infection with Helicobacter pylori are the result of
A. invasion by Helicobacter pylori into the mucosa of the stomach.
B. the production of exotoxins by Helicobacter pylori in the intestines.
C. invasion by Helicobacter pylori into the mucosa of the large intestine.
D. damage to the lining of blood vessels by Helicobacter pylori.
E. the production of toxins by Helicobacter pylori in contaminated food.
Answer: A. invasion by Helicobacter pylori into the mucosa of the stomach.
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