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POSTMIDTERM:LHE BACTE > Chalter 34: Campylobacter and Helicobacter spp. > Flashcards

Chalter 34: Campylobacter and Helicobacter spp. Flashcards

(61 cards)

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1
Q

Shape

A

-Slender, curved, rods
-gull-winged and spiral forms

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2
Q

Motility

A

Motile with polar flagella

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3
Q

Type of bacteria

A

Gram-negative

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4
Q

Size

A

0.2 to 0.5 um

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5
Q

Daughter cells appearance

A

-Gull-winged
-long spirals (formed by joined cells)

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6
Q

Environment

A

Microaerophilic

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7
Q

Requirement

A

-fastidious
-enriched media with
-atmosphere of increased CO2 and decreased oxygen tension

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8
Q

MacConkey agar

A

Many spp. grow on MacConkey agar

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9
Q

-oxidase
-catalase
-Fermentation

A

-positive
-variable
-non-fermentative

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10
Q

Found in

A

-Intestinal tracts of domestic animals
-Genital tracts of domestic animals

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11
Q

Principal disease conditions:

A

Either:
-intestinal (presenting as diarrhea)
-genital (infertility or abortion)

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12
Q

Previously classified in the genus

A

Vibrio

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13
Q

Term ‘vibriosis’ retained for some disease in Campylobacter

A
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14
Q

Spp. of vet importance:

A

-C. fetus subsp. venerealis
-C. fetus subsp. fetus
-C. jejuni subsp. jejuni

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15
Q

Established human pathogen. May have zoonotic potential

A

Order: Campylobacterales
Genus: Helicobacter
Specie: H. pylori

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16
Q

Usual habitat

A

Commensals in the intestinal tracts of warm-blooded animals

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17
Q

-Colonize intestines of birds
-Results in fecal contamination of water courses and stored food

A

-Campylobacter jejuni
-Campylobacter lari

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18
Q

Many Campylobacter is excreted in feces

A
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19
Q

Adapted principally to bovine preputial mucosa

A

Campylobacter fetus subsp. venerealis

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20
Q

Campylobacter are strictly microaerophilic

A
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21
Q

Atmosphere requirement

A

: 5 to 10% oxygen
: 1 to 10% CO2

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22
Q

Primary isolation

A

Skirrow agar (selective enriched medium)

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23
Q

Differentiation is based on:

A

-colonial morphology
-certain cultural,
-biochemical,
-antibiotic-susceptibility characteristics
-phenotyping methods are also increasingly used

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24
Q

Colonial morphology:
-C. fetus subsp. venerealis
-C. fetus subsp. fetus

A

-small, round, smooth, translucent colonies
-with dewdrop appearance

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25
Colonial morphology: -*C. jejuni*
-small, flat, grey colonies -with a spreading, watery appearance
26
Some Campylobacter are slightly pigmented
27
*Campylobacter* do not ferment carbohydrates
28
Pathogenesis and pathogenicity -*C. fetus* subsp. *venerealis* -*C. fetus* subsp. *fetus*
-structurally unusual -Posses a micro capsule or S layer
29
Arranged in lattice formation
Microcapsule or S layer
30
S layer confers resistance to
-serum-mediated destruction -phagocytosis -enhances survival in the genital tract
31
Major outer membrane protein that acts as an adhesin found in:
-*C. jejuni* -*C. fetus* subsp. *fetus* -*C. fetus* subsp. *venerealis*
32
Other genes encoding adhesion proteins such as:
-*cadF* (*Campylobacter* adhesion to fibronectin)
33
Flagellar genes also identified
34
-internalized into epithelial cells following adhesion -may replicate within the membrane-bound compartment -then released by exocytosis from basolateral surface
*C. jejuni* (intestinal pathogen)
35
Cytolethal distending toxin identified in:
-*C. jejuni* -*C. fetus*
36
Has particular tropism for bovine host
*C. fetus* subsp. *venerealis*
37
Contains genes encoding the components of a_____
Type IV secretion system
38
Has also heat stable endotoxin
Pathogenesis is uncertain
39
Infertility
-Cattle -caused by *C. fetus* subsp. *venerealis*
40
Abortion
-Ewes -caused by *C. fetus* subsp. *fetus" or by "C. jejuni*
41
Bovine genital campylobacteriosis -etiology -transmission
-*C. fetus* subsp. *venerealis* -coitus
42
Ovine genital campylobacteriosis -etiology -transmission
-*C. fetus* subsp. *fetus* or (faeces of cattle and sheep) -*C. jejuni* (faeces of wide range of birds and mammals) -fecal-oral route
43
-Intestinal campylobacteriosis in dogs -Avian vibrionic hepatitis -Intestinal campylobacteriosis in humans
- -*C. jejuni* -*C. jejuni*
44
*Helicobacter* -shape -type of bacteria -size -requirement -environment -saccharolytic? -oxidase -catalase
-helical, S-shaped or curved, rods -Gram-negative rods -(3.0 x 0.5 to 0.9 um) -enriched media; some grow on Skirrow's agar -microaerophilic -non-saccharolytic -positive (except *H. canis) -positive
45
*Helicobacter* found in
Gastric mucosa and others are found in the intestine of humans and animals including both domestic and wild animals and birds
46
Characteristic of *Helicobacter* which colonize the gastric mucosa
A strong urease reaction
47
*H. pylori* human pathogen associated with
-gastric ulcers -gastric adenocarcinoma -mucosa-associated lymphoid tissue (MALT) lymphoma
48
*H. pylori* human pathogen associated with many disease morphology
Slightly curved
49
Non-*H. pylori* helicobacters morphology
Long and spiral-shaped
50
Helicobacter is associated with gastritis in
-pigs -cats -dogs
51
-associated with sheep abortion -noe thought to compromise several *Helicobacter* species
'Flexispira rappini'
52
Morphology of *'Flexispira rappini'*
-Distinctive -spindle-shape -gram negative bacteria -with periplasmic fibres -and bipolar tufts of sheathed flagella
53
Catalase production postive
Except: -*C. mucosalis -*C. sputorum* biovar Sputorum
54
Growth at 25 degree celcius
-*C. fetus* subsp. *venerealis* -*C. fetus* subsp. *fetus* -*C. hyointestinalis*
55
Growth at 42 degrees celcius
Except: -*C. fetus* subsp. *venerealis* -*C. fetus* subsp. *fetus*
56
Growth in 1% glycine
All except: -*C. fetus* subsp. *venerealis* (some strains are glycine tolerant and are designated *C. fetus* subsp. *venerealis* biovar Intermedius
57
Growth in 3.5% NaCl
Only: -*C. sputorum* biovar Sputorum
58
Positive for production of H2S (lead acetate method of detection)
All except: -* C. fetus* subsp. *venerealis*
59
Susceptibility to Nalidixic acid (30 ug discs)
Resistant except: -*C. fetus* subsp. *fetus*: (V) -*C. jejuni* subsp. *jejuni*: (S) -*C. coli*: (S)
60
Susceptibility to Cephalothin (30 ug discs)
Only resistant: -*C. jejuni* subsp. *jejuni* -*C. lari* -*C. coli*
61
Table 34.1 Figure 34.2 Figure 34.3

POSTMIDTERM:LHE BACTE (5 decks)

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