Johns and diebel - case study and review

Question 1

Origins of ET-A and ET-B?

What is more associated with SSSS?

Answer 1

ET-A - Gene carried by a bacteriophage that has infected and integrated into staph DNA. Causes Impetigo type lesions.

ET-B - Comes on a plasmid - 5% of all staph have it. It is more associated with SSSS

Question 2

Ritters syndrome

Answer 2

Embilical chord infection with staph.

Question 3

Catalase test

Answer 3

Strep is neg: they use peroxidase with NADH, only by product is water.
Staph is pod: they use catalase which make O2 as a by product

Question 4

Place to find staph if you suspect SSSS

Answer 4

nasal pharynx. NOT the affected skin.