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Gram-positive Bacteria Low GC Gram-positives High GC Gram-positives Firmicutes Actinobacteria - Non-sporulating (Lactic Acid bacteria) - Non-filamentous group I (Corynebacterium) - Sporulating (Bacillus, Clostridium) - Non-filamentous group II (Mycobacterium) - Cell-wall less (mycoplasmas) - Filamentous (Actinomycetes, Streptomyces) Sarcina sp. Sarcina sp. Staphylococcus Streptococcus Staphylococcus pyoderma. Staphylococcus pyoderma. Generalized Staphylococcus aureus skin infection. Greasy pig disease; exudative dermatitis (Staphylococcus hyicus) BAP beta-hemolysis streptococci. Streptococcus sp. Streptococcus sp. Streptococcus sp. Streptococcus sp. Streptococcus sp. Streptococcus sp. Streptococcus sp. Streptococcus pyogenes. Streptococcus pyogenes. Cellulitis Streptococcus pyogenes. Streptococcus pyogenes cellulitis. Impetigo: Streptococcus pyogenes. Cellulitis: This is a term for rapidly spreading acute inflammation through subcutaneous tissue by way of lymphatics, as seen in this boy at autopsy. Note the "rubor" (redness) and "tumor" (edema) of the skin. A drain was inserted in an attempt to alleviate the pressure from the edema. Cellulitis is often caused by streptococcal microorganisms Streptococcus pyogenes: Necrotising fasciitis. Streptococcus pneumoniae. Streptococcus pneumoniae. Streptococcus pneumoniae. Streptococccus pneumoniae. Streptococcus pneumoniae meningitis (necropsy). Streptococcus pneumoniae periorbital cellulitis. Blood smear of patient with Streptococcus pneumoniae infection (bacteremia). Streptococcus sp. Streptococcus agalactiae Strangles: Streptococcus equi. Streptococcus equi. Streptococcus faecalis. Streptococcus faecalis. Streptococcus faecalis. Lactobacillus sp. Lactobacillus sp. Listeria monocytogenes. Listeria monocytogenes 39 month-old baby with listeriosis: hepatosplenomegalie, monocytosis, and fever, Bovine listeriosis (circling disease) often occurs with brain abscess resulting in blindness and neurological dysfunction. Bovine listeriosis (circling disease) often occurs with brain abscess resulting in blindness and neurological dysfunction. Note abscess in brain shown at arrow. Listeria monocytogenes. Erysipelothrix sp. Erysipelothrix rhusiopathiae. Diamond-skin diseases erysipeloid Gram-positive Bacteria Low GC Gram-positives High GC Gram-positives - Non-sporulating (Lactiv Acid bacteria) - Non-filamentous group I (Corynebacterium) - Sporulating (Bacillus, Clostridium) - Non-filamentous group II (Mycobacterium) - Cell-wall less (mycoplasmas) - Filamentous (Actinomycetes, Streptomyces) Bacillus sp. Bacillus sp. Bacillus sp. Bacillus anthracis Bacillus anthracis Bacillus anthracis Cutaneous anthrax. Cutaneous anthrax Cutaneous anthrax. Bacillus thuringiensis Bacillus thuringiensis Spore Parasporal body Bacillus thuringiensis. Bacillus thuringiensis Clostridium perfringens Clostridium perfringens Clostridium perfringens Clostridium sp. Gas gangrene Gas gangrene Gas gangrene Gas gangrene Gas gangrene Gas gangrene Clostridium botulinum. Clostridium botulinum Clostridium Botulinum Botulism Botulism Western duck disease Limberneck The halter and vial of Botulinum antitoxin came from First Flight, a 1,200-pound thoroughbred that, after being injected by U.S. Army researchers with inactivated toxins to stimulate his immune system, became, in 1990, the world's only known source of antitoxin against all known types of the neurotoxin that causes botulism. Clostridium tetani. Clostridium tetani Clostridium tetani Tetanus. Tetanus: opisthotonus Tetan opisthotonus Tetanus: lockjaw (risus sardonicus) Lockjaw (risus sardonicus) Tetanus. Typical poise of the tail by the horse with tetanus Horse with tetanus: breathing with dilated nostrils Clostridium perfringens. Clostridium difficile Clostridium difficile Pseudomembranous Colitis: Pseudomembranous inflammation occurs when an epithelial surface (usually mucosa) becomes destroyed. The ensuing acute inflammatory response produces a fibrinopurulent exudate as the body attempts to cover the wound with a substitute (pseudo) membrane. Pseudomembranous colitis is usually the result of clostridium difficile infection following heavy antibiotic therapy that destroys normal bowel flora, allowing the clostridium to proliferate. Note the normal reddish-brown bowel mucosa in the lower right corner for comparison. Heliobacteria: Heliophilum fasciatum. Heliobacter gestii Gram-positive Bacteria Low GC Gram-positives High GC Gram-positives - Non-sporulating (Lactiv Acid bacteria) - Non-filamentous group I (Corynebacterium) - Sporulating (Bacillus, Clostridium) - Non-filamentous group II (Mycobacterium) - Cell-wall less (mycoplasmas) - Filamentous (Actinomycetes, Streptomyces) Mycoplasma Mycoplasma Mycoplasma-infected cell culture. Mycoplasma Mycoplasma. Mycoplasma pneumonia Spiroplasma sp. Spiroplasma sp. Gram-positive Bacteria Low GC Gram-positives High GC Gram-positives - Non-sporulating (Lactiv Acid bacteria) - Non-filamentous group I (Corynebacterium) - Sporulating (Bacillus, Clostridium) - Non-filamentous group II (Mycobacterium) - Cell-wall less (mycoplasmas) - Filamentous (Actinomycetes, Streptomyces) Corynebacterium diphteriae Corynebacterium diphteriae Corynebacterium diphteriae Corynebacterium diphteriae. Corynebacterium diphteriae. Corynebacterium diphtheriae pharyngitis. Note the pseudomembrane at back of the throat. Diphterie. Diphterie: bull neck (swelling of lymphnodes) Corynebacterium diphteriae. "Difterie" gemaakt door een volgeling van Goya, 18021812. Propionibacterium sp. Arthrobacter sp. Gram-positive Bacteria Low GC Gram-positives High GC Gram-positives - Non-sporulating (Lactiv Acid bacteria) - Non-filamentous group I (Corynebacterium) - Sporulating (Bacillus, Clostridium) - Non-filamentous group II (Mycobacterium) - Cell-wall less (mycoplasmas) - Filamentous (Actinomycetes, Streptomyces) Mycobacterium phlei. Mycobacterial sp. Mycobacterium tuberculosus. Mycobacterium avium AIDS Nocardia sp. Gram-positive Bacteria Low GC Gram-positives High GC Gram-positives - Non-sporulating (Lactiv Acid bacteria) - Non-filamentous group I (Corynebacterium) - Sporulating (Bacillus, Clostridium) - Non-filamentous group II (Mycobacterium) - Cell-wall less (mycoplasmas) - Filamentous (Actinomycetes, Streptomyces) Actinomyces sp. Streptomyces sp. Streptomyces sp. Streptomyces sp. Streptomyces sp. Streptomyces sp.