Gram-Positive Bacteria WisdomCard

Our Guides and Physician Review team have organized the Top 10 Health Resources on Gram-Positive Bacteria and compiled helpful research notes below.


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Research Notes on Gram-Positive Bacteria


Bacteria are classified as positive or negative, depending upon whether they stain violet or pink. Gram-positive bacteria cell walls are thicker, so they retain more of the purple dye and iodine stain. There are six pathogenic gram-positive bacteria: Streptococcus, Staphylococcus, Bacillus, Clostridium, Corynebacterium, Listeria. They are found in various environments.

Fast Facts:

  • Gram staining was developed by Hans Christian Gram, a 19th century Danish bacteriologist.1
  • Actinobacteria and the Firmicutes are the two main groups of gram-positive bacteria.2
  • Bacteria are either round or rod shaped.

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Research Notes References

  1. MicrobiologyBytes: Gram Stain
  2. Microbiology Blog: Gram Positive Bacteria

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