Staphylococcus is a cluster of cocci cells.

University of Wisconsin - Madison

- 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.

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Coccus bacteria are round and spherical in shape.

Coccus

Diplococcus is the an arrangement of two cocci cells. 

Diplococcus

A tetrad is a grouping of four cocci in a square.

Tetrad

Streptococcus is a chain of cocci cells. It is also a diverse genus of bacteria that are further classified on which molecules they produce that can cause an immune response.

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