CH. 21 Microbial Diseases of the Skin and Eyes

Question 1

What is epidermis?

Answer 1

Stratified squamous, it is keratinized.

1st line of defense.

Question 2

What is the Dermis layer of skin?

Answer 2

there are hair follicles, sweat glands, and oil ducts.

Portals of entry.

Question 3

Perspiration

Answer 3

Salt, lysozyme

Rinse off the skin

Question 4

Sebum

Answer 4

Nutritive for some organisms

Question 5

What is the Mucous Membrane?

Answer 5

• lines cavities that open to the outside

- its acidic to protect

Question 6

What is Normal Microbiota (flora)?

usually what Gram + organisms?

Answer 6

resistant to drying and salt

S. epidermis , Micrococcus luteus

Question 7

What do microbes in hair follicles and sweat glands do when washed?

Answer 7

they reestablish populations.
Sweat glanes let off pheromones to attract mate. (apocrine)
Body odor.

Question 8

what are Diphtheroids?

Answer 8

G+ pleomorphic rods
proprionbacterium acnes
carry bacterium xerosis

Question 9

What is dandruff?

Answer 9

fungal infection of the scalp

Question 10

What are the diseases of the skin?

Answer 10

vessicles: small, fluid filled lesion

Bullae: vesicle greater than 1 cm

Macules: flattened red lesions

Papules: raised lesions

Pustules: papule that contains puss

Question 11

What are staphylococcal infections?

Answer 11

S. epi - skin, not pathogenic; forms biofilms

S. aureus - common in nasal passages
pigmented uv light; can invade hosts immune system via … coagulase, produced enterotoxin, blocks chemotaxis, resist opsonization, neutralizes defensin, and lysozyme resistant

Question 12

What is Folliculitis ?

Answer 12

STAPH INFECTION of a hair follicle -> pimple

Question 13

What is a sty?

Answer 13

STAPH INFECTION of the eyelash follicle

Question 14

What is a furuncle?

Answer 14

“boil” localized area of puss

abscess are walled off making antibiotics hard to penetrate

Question 15

What is impetigo?

Answer 15

• caused by staph aureus or strept pyogenes
• enters through break in the skin
• the signs and symptoms of this are NOT caused by the organism but by host immune system

Question 16

Scalded skin syndrome?

Answer 16

form of impetigo caused by staph.

Exfoliation - skin peels deep

Question 17

What is toxic shock syndrome?

Answer 17

caused by staph. aureus

fever, vomit, red rash -> organ failure, shock, death,

Super absorbant - tampons abortions

Question 18

What are streptococcal infections?

Answer 18

meningitis, pneumonia, pharyngitis, ear infections, endocarditis, dental caries.

may produce hemolysins

Question 19

What is necrotizing fasciitis?

Answer 19

systemic 40% mortality rate, body’s immune response attacks joints and heart valves

Question 20

What is Pseudomonas?

Answer 20

P. aeruginosa

• common opportunistic pathogen
• endotoxin and exotoxin producer
• forms biofilms
• blue/green film in flower vases

Question 21

Name diseases of the skin?

Answer 21

• Warts caused by hpv
• Samll pox
• Chicken pox
• Herpes simplex
• Measles (rubeola)
• German measles (rubella)

Question 22

what are fungal diseases of the skin?

Answer 22

• Mycosis
• Dermatomycosis
• Candidiasis -candida albicans

Question 23

what are parasitic infections of the skin?

Answer 23

• Scabies

- Lice