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Gram-positive facultatively anaerobic cocci
Enterococci, staphylococci, and streptococci
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Aerococcus urinae Gram-positive cocci in small clusters on a heart valve
of a patient who died from endocarditis (Gram stain).
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Aerococcus urinae Catalase-negative Gram-positive cocci in small
clusters (tetrads) from a culture (Gram stain).
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Enterococcus faecalis Medium-sized Gram-positive cocci forming also short
chains in vaginal mucus (Gram stain).
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Enterococcus faecalisGram-positive cocci in culture (Gram stain).
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Gemella haemolysans Cocci of G. haemolysans in culture, often staining
Gram-variable (Gram stain).
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Staphylococcus aureus Pus from a furuncle. Gram-positive cocci in small
clusters, surrounded by neutrophil granulocytes and fibrin (Gram stain).
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Staphylococcus aureus Pus from a furuncle. Gram-positive cocci in small clusters, surrounded by numerous neutrophil granulo-
cytes (Gram stain).
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Staphylococcus aureus Gram-positive cocci in small clusters in sputum
(Gram stain).
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Staphylococcus aureus Large numbers of Gram-positive cocci in faeces are usually
Staphylococcus aureus. The diagnosis should be confirmed by culture on a selective medium (Gram stain).
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Staphylococcus aureus Inducible (induced by erythromycin) clindamycin resistance
(MLSB type) detected by the D-zone test.
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Staphylococcus epidermidis These cocci are located within a leukocyte in a thin
blood smear (May-Grünwald-Giemsa stain).
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Staphylococcus epidermidis Gram-positive cocci in clusters from a culture (Gram
staining).
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Staphylococcus saprophyticus Gram-positive cocci from a culture (Gram staining).
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Streptococcus agalactiae Medium-sized Gram-positive cocci (Lancefield group B) in
vaginal mucus. Morphologically indistinguishable from other streptococci and enterococci (Gram stain).
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Streptococcus agalactiae Medium-sized Gram-positive cocci
(Lancefield group B) forming short chains in vaginal mucus (Gram stain).
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Streptococcus group G Small Gram-positive cocci in culture on blood agar
(Gram stain).
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Streptococcus milleri (anginosus) Gram-positive cocci in short chains in pus from a
breast abces (Gram stain).
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Streptococcus pneumoniae Encapsulated Gram-positive diplococci in purulent
sputum (Gram stain).
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Streptococcus pneumoniae Encapsulated Gram-positive diplococci in purulent
sputum (Gram stain).
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Streptococcus pneumoniae Encapsulated Gram-positive diplococci in sputum, also
forming short chains (Gram stain).
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Streptococcus pneumoniae Many Gram-positive diplococci and two polynuclear
leukocytes in cerospinal fluid (Gram stain).
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Streptococcus pneumoniae The majority of the S. pneumoniae strains are inhibited by optochin. The optochin disk is applied on a blood agar
plate incubated overnight in 5% CO2.
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Streptococcus pyogenes Cocci in pus from a tropical ulcus of the leg
(Methyleneblue stain).
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Streptococcus pyogenes Cocci in pus (Gram stain).
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Streptococcus pyogenes Grampositive cocci in pus from a throat (Gram stain).
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Streptococcus pyogenes Grampositive cocci in pus from a throat (Gram stain).
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Streptococcus pyogenes Grampositive cocci in sputum (Gram stain).
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Streptococcus pyogenes The majority of the S. pyogenes strains are inhibited by
bacitracin. The bactracin disk is applied on a blood agar plate incubated overnight in 5% CO2.
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Streptococcus sanguis Gram-positive cocci in short chains in an hemoculture
in a case of endocarditis (Gram stain).
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Streptococcus “viridans” Gram-positive cocci in long chains in an «old» sputum
(Gram stain).
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Streptococcus “viridans” Gram-positive cocci in long chains in an «old» sputum
(Gram stain).