Chapter 22: Skin Infections - Impetigo, Acne, Lyme Flashcards
1
Q
What bacteria causes impetigo? (2)
A
- most common is Streptococcus pyogenes
- also can be cause by S. aureus
2
Q
How do you get impetigo?
A
- usually requires a wound to penetrate the outer layers of skin
- ex. cut, bite, or scratch
3
Q
What does impetigo result in? (3)
A
- inflammation of the epidermis
- results in a thin-walled blister
- blister will break to release oozing plasma
4
Q
What happens after the blister oozes plasma in impetigo?
A
- bacteria spread to other areas of the skin
5
Q
how is impetigo transmitted?
A
- direct or indirect
6
Q
How is impetigo treated?
A
antibiotics
7
Q
what bacteria causes acne vulgaris? (inflammatory acne)
A
- Propionibacterium acnes
- a member of the normal microbiota
8
Q
How does acne vulgaris grow? (2)
A
- grows anaerobically in hair follicles
- eats sebum (oil secreted by skin)
9
Q
What does acne vulgaris result in? (2)
A
- during periods of excess sebum production, follicles can become blocked
- P. acnes overgrows and triggers inflammation
10
Q
How is acne vugaris treated? (3)
A
- antibiotics
- benzoyl peroxide
- isotretinoin (accutane) to redue sebum production
11
Q
What are some side effects of isotretinoin? (2)
A
- depression
- birth defects
12
Q
What bacteria causes lyme disease? (2)
A
- Borella burgdorferi
- Spirochete - tightly wound corkscrew shape
13
Q
Who does lyme disease commonly effect?
A
- deer and mice because they are reservoirs
14
Q
How is lyme disease transferred to humans?
A
- ticks because they are VECTORS
15
Q
What are the symptoms of the first stage of lyme disease?
A
- bullseye shaped rash appears at the bite
- followed by fever, muscle pain and headache
