*Streptococcus pyogenes* (also known as Group A strep) is a species of $$\beta$$-hemolytic bacteria associated with a variety of human diseases. Its strains can be distinguished based on variations in cell-surface M proteins, and they are responsible for infections such as streptococcal pharyngitis, impetigo, toxic shock syndrome, scarlet fever, rheumatic fever, and necrotizing fasciitis.

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An infection that develops in the dermis or hypodermis can cause cellulitis, which presents as a reddened area of the skin that is warm to the touch and painful.

Cellulitis

The term streptococcus (plural: streptococci) refers to a cellular arrangement where spherical cells, or cocci, are connected together to form a long chain.

Streptococcus

https://openstax.org/details/books/microbiology/

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.

OpenStax Microbiology Textbook

Localized inflammation of the dermis and hypodermis, red warm skin and painful to the touch.

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