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14.1: Introduction

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    There are two genera of bacteria that can appear as a streptococcus arrangement that we will take up in the lab: the genus Streptococcus and the genus Enterococcus. Both are Gram-positive cocci 0.5-1.0 µm in diameter, typically occurring in pairs and chains of varying length when grown in a liquid medium, and often occurring singly, in pairs, short chains, and clusters when taken from an agar culture. As learned in Lab 8, they are both catalase-negative.

    Fig \(\PageIndex{1}\): Asexual Reproduction in Molds

    Fig. \(\PageIndex{2}\): Segment of a Mold Hypha Showing Eukaryotic Nature

    Photomicrograph of a Gram stain of <EM>Streptococcus 
    pyogenes</EM> showing Gram-positive cocci in chains. Photomicrograph of a Gram stain of <em>Enterococcus faecalis</em> in a blood culture showing Gram-positive cocci in chains.
    Note Gram-positive (purple) cocci in chains (arrows). Streptococcus pyogenes is the species of Streptococcus responsible for strep throat. Enterococcus species are normal glora of the intestinal tract. Enterococcus species frequently causes infections within the peritoneal cavity, especially following penetrating trauma such as gunshot wounds, knife wounds, and surgical wounds, urinary tract infections, kidney infections, prostate infections, and infections of damaged or compromised skin, such as diabetic or decubitus ulcers, burns, and surgical wounds.
    Copyright; Gary E. Kaiser, Ph.D. The Community College of Baltimore County, Catonsville Campus CC-BY-3.0 Image: Enterococcus faecalis in a Blood Culture. © Gloria Delisle and Lewis Tomalty, authors. Licensed for use, ASM MicrobeLibrary.



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