MCEM Part A Study Guide/Microbiology/Specific Pathogen Groups/Streptococci and Staphylococci

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Section 1: Streptococci and Staphylococci[edit | edit source]

Gram-positive cocci can be divided into two groups using the catalase test. Catalase catalyses the conversion of H2O2 to water and oxygen, causing bubbles. Staphylococci produce catalase and are therefore catalase-positive, whereas Streptococci are catalase-negative.

Streptococci[edit | edit source]

These are facultative anaerobes.

Streptococcus pneumoniae[edit | edit source]

Streptococcus pneumoniae in spinal fluid. FA stain (digitally colorized).

methods of spread of infection principal clinical features

Streptococcus pyogenes[edit | edit source]

methods of spread of infection principal clinical features

Staphylococci[edit | edit source]

Staphylococcus aureus[edit | edit source]

methods of spread of infection principal clinical features

Staphylococcus epidermidis[edit | edit source]

methods of spread of infection principal clinical features

Alpha-haemolytic streptococci[edit | edit source]

endocarditis procedural prophylaxis

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