Bacterial Shapes & Arrangements

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Cocci bacteria are spherical, while Bacilli bacteria are rod-shaped. A singular spherical bacteria is referred to as a coccus. A singular rod-shaped bacteria is referred to as a bacillus. The "Diplo" prefix means two bacteria connected in a chain. The "Strepto" prefix means multiple bacteria connected in a chain. Staphylococci are stacked bacteria.

Another common bacterial shape is spirillium.