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  2. Hemolysis (microbiology) - Wikipedia

    en.wikipedia.org/wiki/Hemolysis_(microbiology)

    If an organism does not induce hemolysis, the agar under and around the colony is unchanged and the organism is called non-hemolytic or said to display gamma-hemolysis (γ-hemolysis). Enterococcus faecalis (formerly called "Group D Strep"), Staphylococcus saprophyticus, and Staphylococcus epidermidis display gamma-hemolysis.

  3. Streptococcus - Wikipedia

    en.wikipedia.org/wiki/Streptococcus

    Gamma-hemolytic species cause no hemolysis. [11] Beta-hemolytic streptococci are further classified by Lancefield grouping, a serotype classification (that is, describing specific carbohydrates present on the bacterial cell wall). [6] The 21 described serotypes are named Lancefield groups A to W (excluding E, I and J).

  4. Streptococcosis - Wikipedia

    en.wikipedia.org/wiki/Streptococcosis

    Similarly, group B streptococcus typically denotes Streptococcus agalactiae, although minor beta-hemolytic group B streptococci like S. troglodytidis exist. [15] While most streptococcal illnesses in humans originate from species adapted to humans, such as S. pneumoniae or S. pyogenes, there are zoonotic species capable of causing infections. [15]

  5. Streptococcus bovis - Wikipedia

    en.wikipedia.org/wiki/Streptococcus_bovis

    Streptococcus bovis is a group of strains of Gram-positive bacteria, originally described as a species, [5] [6] that in humans is associated with urinary tract infections, endocarditis, sepsis, [7] and colorectal cancer. [8] S. bovis is commonly found in the alimentary tract of cattle, sheep, and other ruminants, [9] and may cause ruminal acidosis.

  6. Hemolysis - Wikipedia

    en.wikipedia.org/wiki/Hemolysis

    Hemolysis from Streptococcus. Examples of the blood culture patterns created by (from left) alpha-, beta- and gamma-hemolytic streptococci. Visualizing the physical appearance of hemolysis in cultured blood samples may be used as a tool to determine the species of various Gram-positive bacteria infections (e.g., Streptococcus).

  7. Viridans streptococci - Wikipedia

    en.wikipedia.org/wiki/Viridans_streptococci

    The viridans streptococci are a large group of commensal streptococcal Gram-positive bacteria species that are α-hemolytic, producing a green coloration on blood agar plates (hence the name "viridans", from Latin "vĭrĭdis", green), although some species in this group are actually γ-hemolytic, meaning they produce no change on blood agar. [1]

  8. Group A streptococcal infection - Wikipedia

    en.wikipedia.org/wiki/Group_A_streptococcal...

    Group A streptococcal infections are a number of infections with Streptococcus pyogenes, a group A streptococcus (GAS). [1] S. pyogenes is a species of beta-hemolytic Gram-positive bacteria that is responsible for a wide range of infections that are mostly common and fairly mild. If the bacteria enters the bloodstream, the infection can become ...

  9. Streptococcus pyogenes - Wikipedia

    en.wikipedia.org/wiki/Streptococcus_pyogenes

    However, both Streptococcus dysgalactiae and the Streptococcus anginosus group can possess group A antigen as well. Group A streptococci, when grown on blood agar, typically produce small (2–3 mm) zones of beta-hemolysis, a complete destruction of red blood cells. The name group A (beta-hemolytic) Streptococcus is thus also used. [1]