KATERYNA KON / SCIENCE PHOTO LIBRARY KATERYNA KON / SCIENCE PHOTO LIBRARY
Illustration of Helicobacter pylori bacterium. It is a curved, or spiral, Gram-negative bacilli with flagella at one end (seen here) that make it highly motile. Helicobacter pylori has recently been linked with the formation of stomach ulcers, through observation of the bacterium in biopsy specimens from patients with active chronic gastritis and peptic ulcers.
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