microbiology skin

Question 1

folliculitis

Answer 1

s aureus or epidermidis, find by gram positive cocci treat synthetic penicillin or vancomycin

Question 2

s aureus virulence factors

Answer 2

staphylokinase coagulase b lactamase lipases

Question 3

Scalded Skin Synrome

Answer 3

Staph aureus, exfoliative toxin no tight junctions on skin cells. Infants elderly immunocompromised.

Question 4

impetigo or pyoderma

Answer 4

Most S. Aureues or Group A streptococcus, spread by contact skin to skin or object, yellow vessicles. Penicillin treated.

Question 5

Group A streptococcus

Answer 5

Particularly S. pyogenes. M protein interferes with phagocytosis, Hyaluronic Acid protein disguises.

Question 6

Necrotizing fasciitis

Answer 6

Strep pyogenes. Flesh eating bacteria. Extreme pain out of proportion. Treat broad spectrum antibiotic or amputation.

Question 7

Strep pyogenes virulence factors.

Answer 7

Exotoxin A overactive immune reponse.Steptolysin kills many cells.

Question 8

acne

Answer 8

propinobacterium acnes. Gram positive. Treat with antibiotics or accutane which prevents sebum secretion.

Question 9

psuedomonas infection

Answer 9

Gram negative bacilus found in moist decaying environments. Adhesins toxins, polysaccharide capsule. . Infection in burn victims.Diagnose with pycocyanin

Question 10

gas gangrene

Answer 10

black muscles and skin with bubbles. Clostridium perferingen gpositive anaerobic spore forming bacillis. Toxins lyse RBCs leukocytes, massive inflammatory response. Must be introduced into dead tissue, like massive trauma. Appearance diagnostic. Penicillin antitoxin. Remove dead tissue.

Question 11

small pox

Answer 11

orthopox virus. treat immediate vaccination.

Question 12

warts

Answer 12

pappilomavirus. dsDNA non enveloped.cause infected cells to divide. Spread direct contact. Observation diagnosis.

Question 13

chicken pox

Answer 13

varicella zoster virus. DsDNA enveloped. Latent in nerve cells.

Question 14

rubella

Answer 14

mild infection. causes death of pregnancy. Rubivirus positive single stranded RNA virus. Respiratory secretions. Serological test and vaccine is live attenuated, not for pregnant or immunocompromised.

Question 15

Measles

Answer 15

Morrbillivirus. Rubeola. Most contagious childhood disease. Koplik spots in mouth, red lesions on neck. Subacute sleroizing panencephaltis.

Question 16

leishmaniasis

Answer 16

parastic, cutaneous,protozoan. Transmitted by sandflies. Parasite spread by macrophages. Endemic to tropics, reduce vectors.

Question 17

scabies

Answer 17

sarcoptes scabiei. Prolonged bodily contact.

Question 18

S. aureus how cause disease?

Answer 18

transmitted direct contact, grows into hair follicles,causes fever and inflammation. Immune cells cause pus (WBCs). S. aureus transient.

Question 19

diagnose folliculitis

Answer 19

penicillin, vancomycin, gram positive cocci in pus. Wash hands.

Question 20

herpes

Answer 20

glycoproteins in envelope mediate adhesion, other proteins inactivate immune system.Spread by fusion of infected cells. Spread by mucous membranes. Latency!

Question 21

3 generas of cutaneous mycoses

Answer 21

trichophyton, microsporum, epidermophytan

Question 22

cutaneous mycoses

Answer 22

tineas (athletes foot) Ringworms. tcells actually cause damage.