Lecture 8 - Streptococcus Pyogenes Flashcards
Streptococci
G+ coccus which grows in chains
3 groups of strep
Alpha-hemolutic, beta-hem, gama-hem
Alpha-hemolytic causes…
Endocarditis, tooth decay from dairy foods. Oral pathogen
Beta-Hemolytic includes…
Groups A, B, C. Clearing of RBC
Gama-Hemolytic includes…
Group D, N. Partial clearing of RBC
In what species does strep pyogenes occur?
Only in humans
Symptoms of strep p.
Often asymptomatic
What is the important VF in strep p.
M Protein - binds “factor h” which protects cells from decomposition
What are the two types of hemolysis in strep p.
O - is sensitive to oxygen, S - makes beta-hemolysis
Where and who does pharyngitis occur?
Children/Teens and in the throat
How is strep throat diagnosed
Rapid strep test, if negative then a throat culture is run
How is strep throat treated?
Antibiotics: B-lactams (no resistance) and erythromycin (resistance)
Symptoms of scarlet fever
High fever, strawberry tongue, rash and red bumps
When/why does rheumatic fever occur
Post infection from scarlet or strep throat about 2-3 weeks later. Can cause heart valve damage
Invasive strep in soft tissue is called
Necrotizing Fascitis
