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Gram Positive Cocci (GPC): Introduction, and List of Bacteria, Keynotes, and Related Images

Introduction of Gram Positive Cocci

Gram Positive Cocci (GPC)‘ bacteria retain crystal violet dye and stain blue or purple on Gram’s staining. The most common medically important bacteria of GPC are Staphylococcus aureus, Streptococcus pneumoniae, Enterococcus species, Streptococcus pyogenes, Streptococcus agalactiae and Staphylococcus saprophyticus.

List of Gram Positive Cocci

S. No.Bacteria
Medically Important GPC
1Staphylococcus aureus
2Streptococcus pneumoniae
3Enterococcus faecalis
4Enterococcus faecium
5Streptococcus pyogenes
6Streptococcus agalactiae
7Staphylococcus saprophyticus
Less Important GPC
8Aerococcus
9Gemella
10Lactococcus
11Leuconostoc
12Pediococcus species
13Peptostreptococcus
13Peptoniphilus
15Staphylococcus epidermidis
16Staphylococcus intermedius
17Staphylococcus lugdunensis
18Streptococcus canis (Group G)
19Streptococcus gallolyticus
(Group D, formerly Streptococcus bovis)
20Streptococcus infantarius
(Group D, formerly Streptococcus bovis)
21Streptococcus anginosus
22Streptococcus constellatus
23Streptococcus intermedius
24Streptococcus mitis
25Streptococcus mutans
26Streptococcus salivarius
27Streptococcus sanguis
28Abiotrophia spp.
(nutritionally variant streptococci)
29Granulicatella spp.
(nutritionally variant streptococci)
Table: A list of bacteria belong to Gram Positive Cocci

Keynotes on GPC

  • Staphylococcus ausreus is the most common pathogen among other Gram Positive Cocci (GPC).
  • Streptococcus pyogenes, which are also called group A Streptococcus is the principal bacterium responsible to cause acute pharyngitis.
  • Streptococcus pneumoniae is also called pneumococcus which causes Pneumococcal infections that can range from ear and sinus infections to pneumonia and bloodstream infections (BSIs), and meningitis.
  • S. saprophyticus is the common etiological agent of uncomplicated urinary tract infections, especially in young sexually active females. It also causes complications including acute pyelonephritis, epididymitis, prostatitis, and urethritis.
  • Enterococcus may cause bacteremia, endocarditis, periodontitis, meningitis ,urinary tract infections, and wound infections.

Related Images of Gram positive cocci (GPC)

Gram positive cocci in singles, pairs and clusters of Staphylococcus in Gram staining of culture

Fig. Gram positive cocci in singles, pairs and clusters of Staphylococcus in Gram staining of culture

Enterococcus faecalis in Gram staining of Culture Microscopy

Fig. Enterococcus faecalis in Gram staining of Culture Microscopy

Gram positive diplococci of Pneumococcus in Gram staining of sputum

Fig. Gram positive diplococci of Streptococcus pneumoniae in Gram staining of sputum
Fig. Gram positive cocci in chains of Streptococcus pyogenes in Gram staining of culture
Fig. Cocci in singles, pairs, short and long chains in wet mount of culture microscopy at a magnification of 1600X

Medical Lab Notes

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