Session 11- Streptococci

Question 1

What are strep

Answer 1

Gram positive chains of cocci

Question 2

What is alpha-haemolytic strep

Answer 2

Streptococcus pneuomiae

Oxidise iron in haemoglobin so appear green

Question 3

Beta haemolytic strep

Answer 3

Group A and group B Cause complete rupture of blood cells

Appear white

Question 4

Gamma-haemolytic strep

Answer 4

Have no affect on blood agr

Question 5

What causes streptocococal pharyngitis

Answer 5

Strep pyogenes

Question 6

What is streptococcus toxic shock syndrome

Answer 6

Fatal

Deep tissue infection with strep pyogenes and bacteraemia and vascular collapse an organ failure

Question 7

When is the peak incidence for strep pharyngitis

Answer 7

5 - 15 years

Question 8

Complications of strep pyogenes - scarlet fever

Answer 8

Local or haematogenous spread

High fever, sepsis, arthritis and jaundice

Question 9

virulence factors of strep- CHESS

Answer 9

Capsule
hyluronidase
exotoxin
streptolysins
streptokinase

Question 10

MAD virulence factora

Answer 10

M protein
Adhesins
DNAses

Question 11

complications of strep pyrogenes- PRINCESSA

Answer 11

Pharyngitis
rhuematic fever
impetigo
necrotizing factor
cellutitis
erysipelas- redness of face and lower limbs
scarlet fever
streptococcal toxic shock syndrome
acute post streptococcal glomerulonephritis