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Enterococcus faecium is a Gram-positive, gamma-hemolytic or non-hemolytic bacterium in the genus Enterococcus. [1] It can be commensal (innocuous, coexisting organism) in the gastrointestinal tract of humans and animals, [2] but it may also be pathogenic, causing diseases such as neonatal meningitis or endocarditis.
(right) γ-hemolysis (non-hemolytic, S. salivarius) Hemolysis is the breakdown of red blood cells. The ability of bacterial colonies to induce hemolysis when grown on blood agar is used to classify certain microorganisms. This is particularly useful in classifying streptococcal species. A substance that causes hemolysis is called a hemolysin.
Beta-hemolysis (β-hemolysis), sometimes called complete hemolysis, is a complete lysis of red cells in the media around and under the colonies: the area appears lightened (yellow) and transparent. Streptolysin, an exotoxin, is the enzyme produced by the bacteria which causes the complete lysis of red blood cells.
Streptococcus equinus is a Gram-positive, nonhemolytic, nonpathogenic, lactic acid bacterium of the genus Streptococcus. [5] It is the principal Streptococcus found in the alimentary canal of a horse, [6] and makes up the majority of the bacterial flora in horse feces. [7] Equivalence with Streptococcus bovis has been contested. [4]
Brucella are also non-encapsulated, non-spore forming bacteria that replicate in the ER of their host cells. [5] They are Gram-negative and have a coccobacilli (short rod) shape. They have slightly rounded ends, with slightly outward curving sides. [6] The bacteria form non-hemolytic, non-pigmented convex colonies on blood agar culture media.
Haemophilus influenzae (formerly called Pfeiffer's bacillus or Bacillus influenzae) is a Gram-negative, non-motile, coccobacillary, facultatively anaerobic, capnophilic pathogenic bacterium of the family Pasteurellaceae. The bacteria are mesophilic and grow best at temperatures between 35 and 37 °C. [1]
Cells of B. fragilis are rod-shaped to pleomorphic with a cell size range of 0.5–1.5 × 1.0–6.0 μm. [4] B. fragilis is a Gram-negative bacterium and does not possess flagella or cilia making it immotile.
Bacillus subtilis (/ b ə ˈ s ɪ l. ə s s u b ˈ t iː. l i s /), [3] [4] known also as the hay bacillus or grass bacillus, is a gram-positive, catalase-positive bacterium, found in soil and the gastrointestinal tract of ruminants, humans and marine sponges.