7. Aerobic Gram-positive Bacilli Flashcards Preview

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Flashcards in 7. Aerobic Gram-positive Bacilli Deck (57):
1

Spore forming aerobic gram-positive bacilli

Bacillus spp.

2

Non-spore forming aerobic gram-positive bacilli

Listeria
Erysipelothrix
Corynebacterium

3

Bacillus spp. are found in

Soil

4

True/False. Only some Bacillus spp. form endospores.

False

ALL species of Bacillus form endospores

5

Catalase reaction of Bacillus spp.

Catalase positive

6

Bacillus spp. that is commonly associated with food poisoning

Bacillus cereus

7

Type of food poisoning that is from meat, 24 hours, self-limiting

Diarrheal

8

Type of food poisoning from fried rice, 10 hours, self limiting

Emetic

9

Produced by B. cereus that causes the food poisoning

Toxin

10

Colony morphology of B. cereus

Large
Spreading
β-hemolytic

11

Catalase reaction of B. cereus

Catalase positive

12

Most common disease cause by B. cereus

Food poisoning

13

Most virulent Bacillus spp.

B. anthracis

14

How do humans acquire B. anthracis?

Contact with anthrax-infected animals or animal products (no person-to-person spread)

15

Clinical presentation of B. anthracis

Anthrax

16

3 forms of Anthrax

Cutaneous
Inhalation
Gastrointestinal

17

Anthrax form that is most commonly encountered in naturally occuring cases

Cutaneous

18

Incubation period of cutaneous anthrax

1-12 days

19

Anthrax form that begins as a "viral-like" illness

Inhalation anthrax

20

Incubation period of inhalation anthrax

1-7 days

21

Anthrax form that exhibits abdominal distress, usually accompanied by bloody vomiting or diarrhea

GI anthrax

22

True/False. Recovery from Anthrax confers immunity.

True

23

Antibiotics used after exposure to anthrax

Ciprofloxacin
Tetracycline

24

Colony morphology of Bacillus anthracis

Medium to large irregular
Gray
Medusa head projections, non hemolytic

25

Catalase reaction of Bacillus anthracis

Catalase positive

26

Microscopic chracteristics of Listeria spp.

Gram-positive short rods or coccobacilli

27

What temperature can Listeria spp. grow unlike other bacteria?

4°C

28

Most virulent Listeria spp.

Listeria monocytogenes

29

Disease caused by L. monocytogenes

Listeriosis

30

Habitat of Listeria spp.

Soil
Decaying vegetation

31

True/False. Listeriosis can be passed onto the fetus

True

32

Colony morphology of L. monocytogenes

β-hemolytic
Umbrella pattern motility
Growth at 4°C

33

Most clinically significant Erysipelothrix spp.

Erysipelothrix rhusiopathiae

34

Disease caused by E. rhusiopathiae; a cutaneous infection in humans occasionally acquired by contact with infected animals

Erysipeloid

35

Microscopic appearance of E. rhusiopathiae

Small gram-positive bacilli occuring singly/short chains/filaments

36

Oxygen requirements of E. rhusiopathiae

Aerobic/facultative anaerobic

37

Catalase reaction of E. rhusiopathiae

Catalase negative

38

Specimen of choice for E. rhusiopathiae

Skin biopsy

39

Gram stain appearance of suspect lesion for E. rhusiopathiae

Pleomorphic gram-positive Bacillus

40

Agar used to cultivate E. rhusiopathiae

SBA with 5-10% CO2

41

H2S reaction of E. rhusiopathiae on TSI slant

H2S positive

42

Microscopic appearance of Corynebacterium spp.

Small gram-positive bacilli
May resemble Chinese letters

43

Chracteristic colonial morphology of Corynebacterium spp.

Dry

44

Most significant Corynebacterium human pathogen

Corynebacterium diphtheriae

45

Produced by C. diphtheriae that causes death of eukaryotic cells and tissues by inhibition of cell protein synthesis

Exotoxin

46

Vaccine for C. diphtheriae which maintains the antigenicity of the toxin without the toxicity and prompts production of toxin-neutralizing antibody

Toxoid

47

General media for C. diphtheriae

5% SBA

48

Selective medium for C. diphtheriae

Cystine-tellurite medium (CTBA)

49

Colony morphology of C. diphtheriae in CTBA

Black to gray

50

Differential medium for C. diphtheriae

Tinsdale

51

Colony morphology of C. diphtheriae in Tinsdale medium

Black with brown halos

52

Urease reaction of C. diphtheriae

Urease negative

53

Nitrate reaction of C. diphtheriae

Nitrate positive

54

Catalase reaction of C. diphtheriae

Catalase positive

55

Corynebacterium spp. important in nosocomial or immunocompromised people

C. jeikeium

56

Corynebacteria count that is significant in urine specimens

>10^4 CFU/mL

57

Genera under aerobic gram-positive bacilli

Bacillus
Listeria (+Erysipelothrix)
Corynebacterium