Cocci pt. 2 Flashcards
What are the distinguishing factors of Streptococcus:
- morphology
- structure
- oxygen requirements
- Reaction to environment
- Gram +, in chains
- Contain capsules and slime layer
- Facultative Anaerobes
- Sensitive to environment
What surface antigens do Streptococcus contain?
- C-carbohydrates
- Lipoteichoic acid
- M proteins
What toxins do Streptococcus have?
- Streptolysin
- Erythrogenic toxins
- Superantigen toxins
What do these toxins do:
Streptolysin
Superantigen toxins
Erythrogenic toxin
- Streptolysin= Destroy RBC/leukocytes
- Superantigen toxins= Cause overactive T-cells
- Erythrogenic= cause scarlet fever
What extracellular enzymes do streptococcus have?
- Streptokinase
- Hyaluronimase
What do these enzymes do:
Streptokinase
Hyaluronimase
Streptokinase= Digest clots
Hyaluronimase =Breaks down CT
What kind of skin and throat infections can Streptococcus cause?
Symptoms of these?
Impetigo
Papule with contagious crus
Strep throat
-pus filled absecces
What kind of systemic infections can strep species cause?
Scarlet fever
Pneumonia
Streptococcal toxic shock
What are the symptoms of scarlet fever?
High fever, rash all over body
What are the symptoms of Streptococcal toxic shock syndrome?
Bacteria in blood
Multiple organ failure
What types of diseases do these strep classes cause:
Group A
Group B
Group A= Rhematic fever
Group B= Neonatal meningitis
What types of infections do Group D strep cause?
Endocarditis
Otitis media (ear infection)
How can you test of Strep species?
Agglutination test (antibodies clump to C-carbohydrate)
Hemolysis assay
What are the treatments for Strep species?
- Penicillin
- Vaccine
- Subunit vaccine
- Conjugate vaccine
What strep species are alpha hemolytic?
- S. pneumoniae
- V. streptococci
