Helicobacter pylori

Helicobacter pylori

Helicobacter pylori

Electron micrograph of the stomach bacteria Helicobacter pylori. A research team including Penn State scientists has discovered that a burst of rapid evolution immediately following infection allows this bacteria that causes ulcers in humans to survive the immune system and establish a chronic infection. 

Image: Yutaka Tsutsumi, Fujita Health University School of Medicine
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