Gram -positive bacilli, Anaerobic, Spore forming, Catalase-negative Flashcards

1
Q

The toxins produced by the species are acquired through ingestion or open wounds that have
been contaminated with soil

A

Clostridium

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2
Q

Clostridium are motile with peritrichous flagella except for

A

C. perfringens, C. ramosum, and C.
innocuum

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3
Q

clostridium have swollen sporangia except for

A

C. perfringens

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4
Q

They are non-encapsulated except for

A

C. perfringens

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5
Q

They are carbohydrate fermenters except for

A

C. tatami and C.histolyticum

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6
Q

It is the most commonly isolated member of Clostridum in blood culture

A

Clostridum perfringens(Gas gangrene bacillus)

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7
Q

“Boxcar-shaped” bacilli with oral, subterminal spores

A

Clostridum perfringens(Gas gangrene bacillus)

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8
Q

Virulence factor of C. perfringens

A

Clostridum perfringens(Gas gangrene bacillus)

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9
Q

litmus milk-Colonies exhibit a stormy fermentation of milk

A

Clostridum perfringens(Gas gangrene bacillus)

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10
Q

(+) Reverse CAMP test-formation of an “arrowhead-shaped” zone of hemolysis
towards the test organism

A

Clostridum perfringens(Gas gangrene bacillus)

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11
Q

It is a life-threathening destruction of muscle and other tissues
It is accompanied by bullae, pain, swelling, serous discharge, discoloration and tissue
necrosis

A

Gas gangrene-Clostridum perfringens(Gas gangrene bacillus)

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12
Q

It is caused by the ingestion of Beta-enterotoxin in contaminated food
Improperly stored food allows the germination of the spores and growth of vegetative
bacteria
Symptoms: Bloody diarrhea and abdominal pain

A

Clostridial necrotizng enteritis or enteritis necroticans

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13
Q

It is a soil and environmental inhabitant
The endospores are found in the soil, dust, and feces of many farm animals

A

Clostridium tetani (Tack head bacillus)

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14
Q

Virulence factor of Clostridium tetani

A

Tetanospasmin (neurotoxin)

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15
Q

Microscopy: cells are with terminal spores and swollen sporangis that have a “drumstick” or
“tennis racket” appearance

A

Clostridium tetani (Tack head bacillus)

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16
Q

Biochemical test: (+) gelatinase, and indole; (-) lecithinase and lipase

A

Clostridium tetani (Tack head bacillus)

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17
Q

It is an endopeptidase that selectively cleaves the synaptic vesicle membrane protein,
synaptobrevin
It causes tension or cramping and twisting in skeletal muscles that surround the wound, and
tightness of the jaw muscle

A

Tetanospasmin

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18
Q

It is characterized by trismus or lock jaw and risus sardonicus or distorted grin

A

Tetanus

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19
Q

It occurs when the organism enters an open wound and spreads a potent toxin that mediates
generalized muscle spasm

A

Tetanus

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20
Q

Symptom: Muscular rigidity, difficulty in swallowing, rigidity of the abdomen, chest, back, and
limbs
Incubation period: 3 to 21 days

A

Tetanus

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21
Q

is contracted through the use of contaminated instruments on newborns

A

Tetanus neonatorum

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22
Q

It is found in soil and aquatic sediments
It is a potential bioterrorism agent
It is characterized by the presence of subterminal spores

A

Clostridium botulinum (―Canned food‖ bacillus)

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23
Q

Canned food bacillus

A

Clostridium botulinum (―Canned food‖ bacillus)
q

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24
Q

a neurotoxin that is considered as one of the most potent
natural toxins known to man

A

Botulism toxin

25
Q

It selectively cleaves the synaptic vesicle membrane protein, synaptobrevin, thus preventing
exocytosis and the release of the neurotransmitter, acetlcholine

A

Botulism toxin

26
Q

It requires a small amount to produce paralysis and death

A

Botulism toxin

27
Q

Botulism antigens:

A

A to G

28
Q

The antigens that cause human diseases are

A

A, B and E

29
Q

It is characterized by double or blurred vision, impaired speech, difficulty in swallowing,
weakness, and paralysis

A

Botulism

30
Q

It results from the ingestion of preformed toxin in preserved or meat-based food

A

Foodborne botulism

31
Q

It is commonly caused by botulism toxin A

A

Foodborne botulism

32
Q

It is an actual infection that is caused by ingesting the organism from honey or
through breastfeeding for infants

A

Infant botulism

33
Q

It is the most common cause of antibiotic-associated diarrhea and pseudomembranous colitis

A

Clostridium difficile

34
Q

It is acquired in the hospitals by individuals who are receiving antibiotics

A

Clostridium difficile

35
Q

It is an “infection control dilemma” among hospitalized patients

A

Clostridium difficile

36
Q

It ferments fructose-producing formic acid that changes the color of medium from pink to yellow

A

Clostridium difficile

37
Q

Virulence factor: Toxin A (enterotoxin) and toxin B (cytotoxin)
Microscopy: Chains up to 6 cells that are aligned from end to end with oval, subterminal
endospores

A

Clostridium difficile

38
Q

Cycloserine-cefoxitin-fructose agar (CCFA)-colonies exhibit a yellow color and a
“ground-glass” appearance

A

Clostridium difficile

39
Q

BAP-Colonies exhibit a ―”horse-stable” odor; are non-hemolytic‘ and produce a
fluorescent chartreuse under a long UV light wave

A

Clostridium difficile

40
Q

o Food and fecal specimens that are suspected of C. perfringens food poisoning should be
transported at

A

4 degrees celsius

41
Q

Unacceptable specimes for anaerobic culture of C. difificile

A

a. swabs
b. sputum
c. bronchial washings
d. feces and effluents from ileostomy and colostomy
gastric and small bowel contents

42
Q

It is used to differentiate the aerotolerant strains of Clostridum (catalase negative
from Bacillus (catalase-positive)
Reagent: 15% H2O2
(+) Result: Formation of bubbles

A

Catalase test

43
Q

It is performed using an EYA plate and C. perfringens type A antitoxin.
(+) Result: Inhibition of the lecithinase reaction that is produced by C. perfringens

A

Direct Nagler Test

44
Q

It is a definitive identification test for C. botulinum
It detects the presence of neurotoxins in serum or feces

A

Mouse neutralization test

45
Q

It is used to confirm the presence of C. perfringens
(+) Result: Formation of an ―”arrowhead-shaped” zone of hemolysis at the
intersection of the 2 streaks toward the Clostridum isolates

A

Reverse CAMP test

46
Q

It is the gold standard test for the detection of the C. difficile toxin type B
It requires two to three days to achieve a positive result

A

Cell culture cytotoxicity test

47
Q

+) Lipase reaction: Colonies exhibiting a ―”mother-of-pearl” or ―”gasoline-on-water”
appearance

A

C. bitulinum and C. novyi

48
Q

It is the most commonly isolated anaerobes from blood cultures

A

Bacteroides fragilis

49
Q

It is a Beta-lactamase producer; and is non-motile and saccharolytic

It is a significant cause of intra-abdominal abscesses

A

Bacteroides fragilis

50
Q

Bacteroides bile esculin (BBE) agar-Colonies exhibit a gray color and growth witj 20%
bile, and cause the blackening of the originally yellow-colored agar

A

Bacteroides fragilis

51
Q

Biochemical test: (+) Esculin hydrolysis

A

Bacteroides fragilis

52
Q

It is a significant cause of intra-abdominal abscesses

A

Bacteroides fragilis

53
Q

It is the most common cause of actinomycosis

A

Actinomyces israelii

54
Q

It is part of the indigenous microbiota of the oral cavity

A

Actinomyces israelii

55
Q

It is frequently isolated from blood cultures, but its presence also indicates contamination of the
patient‘s skin due to the improper cleansing of the site prior to a phlebotomy

A

Propionobacterium acnes

56
Q

The species of this genus are pleomorphic, Gram-positive rods
It non - motile, and may also be considered as an aerotolerant anaerobe

A

Lactobacillus

57
Q

It is part of the indigenous microbiota of the mouth, GIT, and vaginal canal
It protects the female genital tract from urogenital infections

A

Lactobacillus acidophilus

58
Q

Differential medium: Tomato juice agar (pH 3 to 4)

A

Lactobacillus acidophilus

59
Q

Biochemical test: (-) Catalase , H2S and esculin hydrolysis

A

Lactobacillus acidophilus