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Where do gram positive cocci reside?

found in soil, on skin, mucous membranes and skin glands
normal flora

Examples of Gram positive cocci

Staphylococcus aureus
Staphylococcus epidermidis
Streptococcus pneumoniae
Streptococcus pyogenes
Micrococcus spp.

Staphylococcus aureus

causes toxic shock syndrome

What is Toxic shock syndrome

a common form of food poisoning and skin boils

What color pigment does S. aureus produce when grown on blood agar

pale yellow

Staphylococcus epidermidis

White colonies. Normal flora of the skin and an opportunistic pathogen.

Streptococcus Pneumoniae

cells usually arranged in pairs. Causes pneumonia

Streptococcus pyogenes

Causes peripheral fever, strep throat, rheumatic fever and scarlet fever.


exoenzymes that breakdown red blood cells

what is alpha hemolysis

partial breakdown of RBC's causes blood agar to turn greenish tan

What is beta hemolysis

total breakdown of RBC's causes blood agar to clear

What bacteria may have alpha hemolyis, beta hemolysis, and be pathogenic

Streptococcus pyogenes

Micrococcus spp.

Usually nonpathogenic. Several species produce red, yellow and orange pigments

Which bacteria will produce white colonies in gram positive cocci?

S. epidermidis

Normal flora of sinus and mucous membranes

S. aureus

Produces a pale yellow pigment when grown on blood agar for gram positive cocci

S. aureus

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