chapter 5: staphylococci

Question 1

which species of staphylococcus is coagulase positive and what does this do

Answer 1

staphylococcus aureus

-activates prothrombin–>causing blood to clot

Question 2

3 major species of staphylococcus

Answer 2

aureus
epidermidis
saprophyticus

Question 3

septic arthritis

-infection of what and what age group

Answer 3

invasion of synovial membrane by staph aureus

-most common causing pathogen of this disease in the pediatric age group and in adults over 50

Question 4

pneumonia and staph aureeus

Answer 4

rare but severe cause of communityu acquired bacterial pneumonia

more common in hospitalized pts

usually follows viral influencza

Question 5

disease caused by direct organ invasion of stpah aureus

Answer 5

pneumonia
meningitis brain abscess
osteomyelitis
acute endocarditis
septic arthritis
skin infections

Pass, Mo

Question 6

osteomyelitis from s aureus usualy occurs in what population

Answer 6

boys under 12

Question 7

minor skin infections are almost exclusively caused by either

Answer 7

streptococcus pyogenes
or by staph aureus

-impossible to tell which

Question 8

contagious infection on face, especially around mouth, pustules, which crust over to become honey-colored, wet, flaky

Answer 8

impetigo

Question 9

infection of hair follicle that penetrates deep into subcut tissue becomes a ____ these may bore through to produce multiple contigous painful lesions communicating under the skin called

Answer 9

furuncle

carbuncles

Question 10

CA-MRSA carries which gene which incodes ___ toxin associated with a propensity to form ___

Answer 10

PVL

skin abscesses

Question 11

gene for methicillin resistance is carried on a genomic strand cealled

Answer 11

SCCmec

Question 12

what is the most frequent organism isolated from infected indwelling prosthetic devices

Answer 12

staphylococcus epidermidis
-have polysacch capsules that allow adherence to these prostehttic materials

-forms biofilms on intravascular catheters so it can bind

Question 13

staphylococcus saprophyticus clinical relevance

Answer 13

leading cause of UTI in sexually young women

-coagulase negative

Question 14

protective proteins and functions of staphylococcus aureus

Answer 14

protein A binds IgG, preventing opsonization and phagocytosis

coagulase: allows fibrin formation around organism

hemolysisns

leukocidins

penicillinase

Question 15

tissue destroying proteins for staph aureus

Answer 15

hyaluronidase: breaks down connective tissue
staphylokinase: lyses formed clots

likpase

Question 16

toxins from staph aureus and effect

Answer 16

exfoliatin: scalded skin syndrome
enterotoxin: food poisoning

toxic shock syndrome toxin: TSST-1

Question 17

virulence of staph epidermidis

Answer 17

polysaccharide capsule that adheres to variety of prosthetic devices, forms biofilm

highly resistant to antibiotics

Question 18

which strain of staff is a frequent skin contaminant in blood cultures

Answer 18

staph epidermidis