Bacterial classification by gram stain, shape, and growth requirements, with the key lab test used to identify each organism.
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- What is the Gram stain and cellular arrangement of Staphylococcus?
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Gram-positive cocci in clusters- What is the Gram stain and cellular arrangement of Streptococcus?
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Gram-positive cocci in chains- Which lab test distinguishes Staphylococcus from Streptococcus, based on breakdown of hydrogen peroxide?
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Catalase test (Staphylococcus is catalase-positive)- Is Streptococcus catalase-positive or catalase-negative?
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Catalase-negative- Which coagulase test result identifies Staphylococcus aureus among staphylococci?
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Coagulase-positive- Which coagulase-negative staphylococcus is novobiocin-sensitive?
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Staphylococcus epidermidis- Which coagulase-negative staphylococcus is novobiocin-resistant?
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Staphylococcus saprophyticus- Which streptococcus species is optochin-sensitive?
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Streptococcus pneumoniae- Which alpha-hemolytic streptococcal group is optochin-resistant?
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Viridans streptococci- Which streptococcus is bacitracin-sensitive?
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Group A Streptococcus (Streptococcus pyogenes)- Which streptococcus is bacitracin-resistant?
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Group B Streptococcus (Streptococcus agalactiae)- Which streptococcus gives a positive CAMP test?
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Group B Streptococcus (Streptococcus agalactiae)- What does alpha hemolysis look like on blood agar?
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Partial hemolysis with a greenish discoloration- What does beta hemolysis look like on blood agar?
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Complete clearing around the colony- What does gamma hemolysis look like on blood agar?
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No hemolysis
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