WEEK 5: STREPTOCOCCI Flashcards
- Complete lysis of RBC’s around colony
- **Clear area **around colony
BETA
- Partial lysis of RBC’s around colony
- Greenish discoloration of area around colony
ALPHA
- No lysis of RBC’s around colony
- No change in agar
GAMMA
Small area of intact RBC around colony surrounded by a wider zone of complete hemolysis
ALPHA PRIME
i. Gram (+) cocci arranged in pairs or chains
ii. Facultative anaerobe but some are aerotolerant anaerobes
iii. Some are capnophilic
iv. Non-motile; (-) catalase, oxidase and gas production
Streptococci
Negative in Catalase test
Streptococci
test the ability of the organism to
breakdown of H2O2 into oxygen and water
Catalase Test
organisms that are positive in catalase test
Staphylococcus & Micrococcus
in catalase test, copious bubble form if the organism is?
Positive
No or few bubbles
Negative in Catalase test
What is being extracted in Lancefield Classification?
C Carbohydrate
Group A strep
S. pyogenes
Group B strep
S. agalactiae
Group C strep
S. dysgalactiae, S. equisimilis
Group D Non enterococcus
S. bovis group / S. gallolyticus
Group D Enterococcus
E. faecalis, E. faecium
Pneumococcus
S. pneumoniae
Which of the species under Streptococci group does not have a Lancefield Classification?
S. pneumoniae
Viridans strep (A, C, F, G, N)
S. anginosus, mutans, mitis
What is the hemolytic pattern of Group A strep? (S. pyogenes)
β (beta)
What is the hemolytic pattern of Group B strep? (S. agalactiae)
β (beta)
What is the hemolytic pattern of Group C strep? (S. dysaglactiae, S. equisimilis)
β (beta)
What is the hemolytic pattern of Group D Non enterococcus? (S. bovis group)
α,γ (alpha, gamma)
What is the hemolytic pattern of Group D Enterococcus? (E. faecalis, E. faecium)
α,β,γ (alpha, beta, gamma)