The term diplococcus (plural: diplococci) refers to a cellular arrangement consisting of a pair of cocci, where two spherical cells are attached together.

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- Coccus
- Diplococcus
- Tetrad
- Streptococcus
- Staphylococcus 

Common Arrangements of Cocci

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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The term coccus (plural: cocci) is used to describe prokaryotic cells that possess a round, spherical shape.

Coccus

Diplococcus

The term tetrad (plural: tetrads) describes a cellular arrangement consisting of a grouping of four cocci, or spherical cells, arranged in a square.

Tetrad

Streptococcus is a genus of low G+C gram-positive bacteria and a cellular arrangement of spherical cells forming chains. It includes many pathogens responsible for human diseases such as pharyngitis (strep throat), scarlet fever, rheumatic fever, glomerulonephritis, pneumonia, and other respiratory infections.

Streptococcus

The term staphylococcus (plural: staphylococci) describes a cellular arrangement where spherical cells (cocci) form grape-like clusters. Taxonomically, Staphylococcus is a genus of low G+C gram-positive bacteria.

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