Gram Positive Cocci Flashcards
Staph epidermidis
Gram Stain and Colony descriptions
GPC in Loose clusters and in tetrads
Staphylococcus epidermidis
Growth on media
Small to medium, Smooth, raised, entire, gray-white
Staphylococcus epidermidis
Tests
Catalase positive Coagulase negative Novobiocin Sensitive DNase negative (no zone of inhibition) Mannitol fermentation negative (remains pink)
Staph aureus
Gram Stain
GPC in clusters
Staph aureus
Growth on media
Medium to large, Smooth, raised, entire, golden yellow
Staph aureus
Tests
Catalase pos Coagulase pos Gelatin hydrolysis pos DNase pos Mannitol fermentation pos (turns yellow)
Staph saprophyticus
Gram Stain
GPC in pairs or tetrads
Staph saprophyticus
Growth on media
Large, convex, entire, white (can be yellow or orange), glossy
Staph saprophyticus
Tests
Catalase pos
Coagulase neg
Novobiocin resistant
Urease pos
Strep pyogenes
Gram Stain
GPC in chains
Strep pyogenes
Growth on media
Beta hemolytic, grayish-white
Strep pyogenes
Tests
Catalase neg
Beta hemolytic
PYR pos
Bacitracin Susceptible
Strep agalactiae
Gram Stain
GPC in chains
Strep agalactiae
Growth on media
Beta hemolytic, flat, glossy
Strep agalactiae
Tests
Catalase neg Beta hemolytic Hippurate pos CAMP pos Carrot broth pos