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16 terms

Bacterial Survey Addendum Gram Positive Cocci

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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.
hemolysins
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