Unit 6b

Question 1

streptococci is classified based on

Answer 1

colony morphology and hemolytic reactions on blood agar

Question 2

based on the antigenic nature of cell wall carbohydrates

Answer 2

Lancefield classification

Question 3

developed Lancefield classification in the 1930’s

Answer 3

Rebecca C. Lancefield

Question 4

best defined virulence of factor in S. pyogenes

Answer 4

M protein

Question 5

M protein is encoded by the gene

Answer 5

emm

Question 6

prevents opsonized phagocytosis by neutrophils or macrophages

Answer 6

hyaluronic acid capsule

Question 7

may favor the spread of the organism through the tissues

Answer 7

hyaluronidase

Question 8

causes the lysis of fibrin clots

Answer 8

streptokinase

Question 9

rash caused by S.pyogenes

Answer 9

scarlet fever

Question 10

incubation period of pharyngitis

Answer 10

1-4 days

Question 11

a localized skin disease

Answer 11

impetigo

Question 12

a rare infection of the skin and subcutaneous tissues observed frequently in elderly patients

Answer 12

erysipelas

Question 13

can develop following deeper invasion by streptococci

Answer 13

cellulitis

Question 14

characterized by a diffuse red rash that appears on the upper chest and spreads to the trunk and extremities

Answer 14

scarlet fever

Question 15

an invasive infection characterized by rapidly progressing inflammation of necrosis

Answer 15

necrotizing fascitis

Question 16

a condition in which the entire organ system collapses, leading to death

Answer 16

Streptococcal Toxic Shock Syndrome

Question 17

typically follows S.pyogenes pharyngitis

Answer 17

rheumatic fever

Question 18

characterized by fever and inflammation of hearts, joints, blood vessels, and subcutaneous tissues

Answer 18

rheumatic fever

Question 19

colonis of S.pyogenes on blood agar are what?

Answer 19

small, transparent and smooth

Question 20

it may be found as normal flora in the genitourinary tract

Answer 20

Streptococcus agalactiae

Question 21

important virulence factor in infections with group B streptococci

Answer 21

capsule

Question 22

appears to be the most significant component of the capsule and a critical virulence determinant

Answer 22

sialic acid

Question 23

commonly infects newborns and pregnant women

Answer 23

Streptococcus agalactiae

Question 24

occurs soon after birth

Answer 24

neonatal sepsis

Question 25

the most important factor in infection is the?

Answer 25

presence of group B streptococcus in the vagina

Question 26

drug of choice for neonatal sepsis

Answer 26

penicillin g or cefazolin

Question 27

group b streptococci grown on blood agar as?

Answer 27

grayish white mucoid

Question 28

normal flora of the respiratory tract

Answer 28

streptococcus pneumoniae

Question 29

drug of choice for pneumoniae

Answer 29

penicillin or erithromycin

Question 30

young cultures for strep pneuomoniae

Answer 30

round,glistening,wet,mucoid, dome-shaped

Question 31

normal flora for the upper respiratory tract

Answer 31

Viridans streptococci

Question 32

viridans means

Answer 32

green

Question 33

endocarditis

Answer 33

infection of heart values

Question 34

dental carries

Answer 34

strep. sanguis and strep. mutans

Question 35

natural inhabitants of intestinal tract

Answer 35

enterococcus

Question 36

most common species of enterococcus

Answer 36

E.faecium followed by E.faecalis

Question 37

E.faecalis also produces a two-subunit toxin called as

Answer 37

cytotoxin

Question 38

the most common infection for enterococcus

Answer 38

uti

Question 39

often observed in patients receiving hemodialysis

Answer 39

entorococcal bacteremia

Question 40

seen mainly in elderly patients with prosthetic heart valves

Answer 40

endocarditis

Question 41

drug of choice for endocarditis

Answer 41

aminoglycoside with ampicillin or penicillin

Question 42

encoded the emergence of vancomycin-resistant Enterococcus

Answer 42

vanAgene

Question 43

lab identification for Enterococci

Answer 43

positive for bile esculin

Question 44

often used for treatment of infections caused by vancomycin-resistant enterococci

Answer 44

linezolid

Question 45

very similar to enterococcus on blood agar

Answer 45

aerococcus

Question 46

a very similar to viridans streptococci on blood agar

Answer 46

leuconostoc

Question 47

is aerococcus resistant or susceptible to vancomycin?

Answer 47

susceptible

Question 48

is leuconostoc resistant or susceptible to vancomycin?

Answer 48

resistant

Question 49

rare isolate in patients who have septicemia

Answer 49

pediococcus

Question 50

is pediococcus resitant or susceptible to vancomycin?

Answer 50

resistant