Streptococcus

Exam Cram

Classification

Haemolysis

1. Alpha haemolysis

2. Beta haemolysis

Alpha Haemolysis

Examples

• Streph pneumonia

Tend to be less aggressive than beta group and more resistant to antibiotics

Beta Haemolysis

More aggressive than alpha group but more susceptible to antibiotics

Streph antigen

• A- streph pyogenes, GAS (group A streph)

• B- streph agalactiae- GBS, neonata meningitis, 'baby streph'

• C, D, E... etc
  
  

Gamma Haemolysis

These organisms show no haemolysis, so aren't really strephlococci

Examples: enterococcus, staphlococcus epidermis

Enterococcus (found in bowel) has been re-classified into its own subset, distinct from strephtococcus

Streph Pyogenes (GAS)

Streph Agalactiae (GBS)

Other Streph

Streph aginosus

Written 2024