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What is the size of spirilla bacteria?

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The size of spirilla bacteria tends to average between 1.4 and 1.7 micrometers in width and approximately 60 micrometers in length. They tend to have large, corkscrew or spiral shapes with up to five helical turns or twists. One inch is equal to approximately 25,400 micrometers.

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Unlike the closely related spirochete bacteria that have similar helical shapes and somewhat flexible bodies, spirilla bacteria have fairly rigid bodies. Spirilla bacteria move by the rotation of hair-like tufts at either end called flagellum. The Helicobacter pylori, or H. pylori, bacteria is a species of spirilla bacteria that causes peptic ulcers and adenocarcinoma, a type of cancer that forms in certain glands, in humans. Other forms cause bacterial diarrhea, transmitted by undercooked poultry and shellfish and contaminated water.

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