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Bacteriology > Unit 6b > Flashcards

Unit 6b Flashcards

1
Q

streptococci is classified based on

A

colony morphology and hemolytic reactions on blood agar

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2
Q

based on the antigenic nature of cell wall carbohydrates

A

Lancefield classification

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3
Q

developed Lancefield classification in the 1930’s

A

Rebecca C. Lancefield

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4
Q

best defined virulence of factor in S. pyogenes

A

M protein

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5
Q

M protein is encoded by the gene

A

emm

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6
Q

prevents opsonized phagocytosis by neutrophils or macrophages

A

hyaluronic acid capsule

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7
Q

may favor the spread of the organism through the tissues

A

hyaluronidase

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8
Q

causes the lysis of fibrin clots

A

streptokinase

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9
Q

rash caused by S.pyogenes

A

scarlet fever

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10
Q

incubation period of pharyngitis

A

1-4 days

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11
Q

a localized skin disease

A

impetigo

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12
Q

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

A

erysipelas

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13
Q

can develop following deeper invasion by streptococci

A

cellulitis

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14
Q

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

A

scarlet fever

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15
Q

an invasive infection characterized by rapidly progressing inflammation of necrosis

A

necrotizing fascitis

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16
Q

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

A

Streptococcal Toxic Shock Syndrome

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17
Q

typically follows S.pyogenes pharyngitis

A

rheumatic fever

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18
Q

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

A

rheumatic fever

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19
Q

colonis of S.pyogenes on blood agar are what?

A

small, transparent and smooth

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20
Q

it may be found as normal flora in the genitourinary tract

A

Streptococcus agalactiae

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21
Q

important virulence factor in infections with group B streptococci

A

capsule

22
Q

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

A

sialic acid

23
Q

commonly infects newborns and pregnant women

A

Streptococcus agalactiae

24
Q

occurs soon after birth

A

neonatal sepsis

25
Q

the most important factor in infection is the?

A

presence of group B streptococcus in the vagina

26
Q

drug of choice for neonatal sepsis

A

penicillin g or cefazolin

27
Q

group b streptococci grown on blood agar as?

A

grayish white mucoid

28
Q

normal flora of the respiratory tract

A

streptococcus pneumoniae

29
Q

drug of choice for pneumoniae

A

penicillin or erithromycin

30
Q

young cultures for strep pneuomoniae

A

round,glistening,wet,mucoid, dome-shaped

31
Q

normal flora for the upper respiratory tract

A

Viridans streptococci

32
Q

viridans means

A

green

33
Q

endocarditis

A

infection of heart values

34
Q

dental carries

A

strep. sanguis and strep. mutans

35
Q

natural inhabitants of intestinal tract

A

enterococcus

36
Q

most common species of enterococcus

A

E.faecium followed by E.faecalis

37
Q

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

A

cytotoxin

38
Q

the most common infection for enterococcus

A

uti

39
Q

often observed in patients receiving hemodialysis

A

entorococcal bacteremia

40
Q

seen mainly in elderly patients with prosthetic heart valves

A

endocarditis

41
Q

drug of choice for endocarditis

A

aminoglycoside with ampicillin or penicillin

42
Q

encoded the emergence of vancomycin-resistant Enterococcus

A

vanAgene

43
Q

lab identification for Enterococci

A

positive for bile esculin

44
Q

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

A

linezolid

45
Q

very similar to enterococcus on blood agar

A

aerococcus

46
Q

a very similar to viridans streptococci on blood agar

A

leuconostoc

47
Q

is aerococcus resistant or susceptible to vancomycin?

A

susceptible

48
Q

is leuconostoc resistant or susceptible to vancomycin?

A

resistant

49
Q

rare isolate in patients who have septicemia

A

pediococcus

50
Q

is pediococcus resitant or susceptible to vancomycin?

A

resistant

Bacteriology (8 decks)

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