Most stomach ulcers are caused by the bacterium ____.

A) Escherichia coli
B) Helicobacter pylori
C) Bacillus anthracis
D) Streptococcus mutans
E) Staphylococcus aureus

Stomach Ulcers

Sores that develop on the lining of the stomach, upper small intestine, or esophagus, often resulting from Helicobacter pylori infection or the use of NSAIDs.

Helicobacter Pylori

A type of bacteria that infects the stomach lining and is associated with ulcers and some forms of stomach cancer.

Escherichia Coli

A type of bacteria commonly found in the intestines of humans and animals, some strains of which can cause food poisoning.