Gram-positive Bacteria

    Related Articles

    Gram-positive bacteria are bacteria that give a positive result in the Gram stain test. Gram-positive bacteria take up the crystal violet stain used in the test and then appear purple-colored when seen through a microscope. Six gram-positive genera are typically pathogenic in humans. Two of these, Streptococcus and Staphylococcus, are cocci (sphere-shaped). The remaining organisms are bacilli (rod-shaped) and can be subdivided based on their ability to form spores. The non-spore formers are Corynebacterium and Listeria (a coccobacillus), whereas Bacillus and Clostridium produce spores.

    Gram-Positive Endospore-Forming Rods

    Gram-positive bacteria retain the crystal violet stain when treated by Gram’s method. Gram-positive endospore-forming rods are rod-shaped bacteria that form endospores. Representative genera include Bacillus and Clostridium. They include:

    Gram-Positive Asporogenous Rods, Regular

    Gram-positive not spore-bearing rods, regular, are a group of regular rod-shaped bacteria that stain gram-positive and do not produce endospores. They include:

    Gram-Positive Asporogenous Rods, Irregular

    Gram-positive not spore-bearing rods, irregular, are a group of irregular rod-shaped bacteria that stain gram-positive and do not produce endospores. They include:

    • Acetobacterium
    • Actinobacteria
    • Butyrivibrio
    • Corynebacterium
    • Eubacterium
    • Propionibacteriaceae
    • Thermoanaerobacter

    Gram-Positive Cocci

    Video Credits: Neural Academy
    Image Credits: Scientific Animations, WikiMedia


    Other Topics

    Can Birds Walks On Water?

    Not exactly. But there are several birds that give a pretty good impression of being able to do so. One is Wilson's...

    Clumber Spaniel

    History & Overview The Clumber is an excellent tracker and retriever, albeit slower than other spaniels. This breed...

    Causes Of Dog Bites

    Overview Dogs are a part of life. Millions of people have dogs as pets, but no matter how...


    Overview The Osprey (Pandion haliaetus), or Fish Hawk, sights its prey while hovering, then plunges feet first into...

    Tibetan Terrier

    History & Overview Despite his name, the Tibetan Terrier is not terrier-like in either mind or body, and...