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

Section 1: Streptococci and Staphylococci Edit

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

These are facultative anaerobes.

Streptococcus pneumoniae Edit

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

methods of spread of infection principal clinical features

Streptococcus pyogenes Edit

methods of spread of infection principal clinical features

Staphylococci Edit

Staphylococcus aureus Edit

methods of spread of infection principal clinical features

Staphylococcus epidermidis Edit

methods of spread of infection principal clinical features

Alpha-haemolytic streptococci Edit

endocarditis procedural prophylaxis