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

University of Southern Mississippi

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

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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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OpenStax Microbiology Textbook

The bacterium *Streptococcus pyogenes* is a Lancefield group A, $$\beta$$-hemolytic species classified as a pyogenic pathogen due to the pus production associated with its infections. It is the most common cause of bacterial pharyngitis (strep throat) and can also lead to skin infections ranging from mild impetigo to life-threatening conditions like necrotizing fasciitis (flesh-eating disease).

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