Gram-positive Bacteria

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 to be 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


Enterococcus faecalis bacteria, leading cause of hispital-associated, surgical wound, and urinary tract infections.
Source: CDC/Pete Wardell

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:



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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


 

 


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