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Flashcards in Exam 1 skin infections Deck (17):
1

Describe the mechanism of a comedone formation

Oil creates an anaerobic environment for certain bacteria (propionibacterium acnes) and an immune response with neutrophils creates the pus/white head

2

What is the most common bacteria that causes acne?

Propionibacterium acnes

3

What causes impetigo?

Staphylococcus aureus and Streptococcus pyogenes

4

What is the most common cause of surgical infections?

Staph aureus

5

What is the tree of Staph aureus

Gram + cocci, catalase +, coagulase +

6

What are the virulent factors of staph aureus?

Protein A (Fc binding portion), coagulase (forms fibrin coat), hymolysins and leukocidins, hyaluronidase, staphylokinase, lipase

7

What causes toxic shock syndrome?

Staph aureus and Strep pyogenes

8

What causes scalded skin syndrome?

Staph aureus

9

What are the toxins released by staph aureus to cause scalded skin syndrome?

exfoliative toxins ET-A and ET-B that diffuse systemically

10

What is the tree of Streptococcus pyogenes?

Gram+ cocci, catalase -, Beta hemolytic, bacitracin

11

What are virulence factors of Streptococcus pyogenes?

Streptokinase, M protein, Hyaluronidase, DNase, Streptolysin O, Streptolysin S

12

What is the treatment of impetigo?

Mupirocin, pleuromutilin, oral cephalexin

13

What can cause cellulitis?

Staph aureus and strep pyogenes

14

What can cause gas gangrene

Clostridium perfringes

15

What is the tree for Clostridium perfringes?

Gram+ bacilli, spore forming, obligate anaerobe, non-motile

16

What is the tree of Pseudomonas aeruginosa

Gram- bacilli, lactose non-fermentor, oxidase +, glucose non-frementor

17

What causes hot tub folliculitis?

Pseudomonas aeruginosa