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Aeromonas, campylobacter
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Cards (130)
What is the genus of the bacteria discussed in the study material?
Aeromonas spp.
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Where can Aeromonas spp. be found?
In
freshwater
,
estuarine
, and
chlorinated
water
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Are Aeromonas spp. part of the human flora?
No
,
they are not part of the human flora
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What type of anaerobe is Aeromonas spp.?
Facultative
anaerobe
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What diseases are caused by
Aeromonas spp.
?
They are responsible for a variety of diseases among
warm-
and
cold-blooded
animals
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What is the causative agent of "red-leg" disease?
Aeromonas spp.
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What syndrome does Aeromonas spp. cause in humans?
A
nebulous
syndrome known as "
traveler's diarrhea
"
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What is the shape and Gram stain result of Aeromonas spp.?
Gram-negative straight rods
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What type of colonies do Aeromonas spp. form on CIN agar?
"
Bull's eye
colonies" with an
apron-like
pattern
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What is the appearance of Aeromonas spp. colonies on BAP?
Large
,
round
,
raised
,
white
, and
opaque
colonies
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Is Aeromonas spp. a lactose fermenter?
Yes
, it is a
lactose
fermenter on
MAC
agar
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What are the biochemical test results for Aeromonas spp. regarding oxidase and catalase?
Both oxidase and catalase tests are
positive
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What is the motility characteristic of Aeromonas spp.?
Motile
with a
single polar flagellum
, but some species are
nonmotile
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What temperature range can Aeromonas spp. typically grow in?
From
4°C
to
42°C
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How does Aeromonas spp. respond to NaCl concentrations?
It will
grow
in
media
with
0%
NaCl but
not
in
6%
NaCl
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What is the result of the string test for Aeromonas spp.?
Negative
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What is the fermentation result for inositol in Aeromonas spp.?
Positive
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Which Aeromonas spp. are
indole positive
?
caviae
,
A. hydrophila
,
A. veronii
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What are the TSI results for A.
caviae
?
A
/
A
, (
-
)
gas
, (
-
)
H2S
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What are the TSI results for A. hydrophila and A. veronii?
A/A,
(
+
)
gas
, (
+
)
H2S
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What are the key biochemical and physiologic characteristics of Aeromonas spp.?
Oxidase
and
Catalase positive
Glucose fermenters
Motile
with
single polar flagellum
(some
nonmotile
)
Growth
from
4°C
to
42°C
Grows
in
0% NaCl
,
not
in
6% NaCl
Negative String test
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What are the complications associated with Aeromonas spp. infections?
Hemolytic-uremic
syndrome and
kidney
disease
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What types of infections can Aeromonas spp. cause?
Gastroenteritis
,
septicemia
,
meningitis
,
keratitis
, and
wound
infections
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What are the groups of Aeromonas spp. based on temperature preferences?
Mesophilic
Group:
A. hydrophila complex
A. veronii complex
A. caviae complex
Psychrophilic
Group:
A. salmonicida
(
fish pathogen
)
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What is the characteristic of A. salmonicida?
It is a fish pathogen and non-motile
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What is the optimal growth temperature for A. caviae?
22°C
to
25°C
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What infections are commonly caused by A. hydrophila?
Gastroenteritis
and
cellulitis
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What are the differential characteristics of Vibrio, Aeromonas, and Plesiomonas regarding the oxidase test?
Vibrio:
+
/-
Aeromonas:
-
/
+
Plesiomonas:
+
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What are the differential characteristics of Vibrio, Aeromonas, and Plesiomonas regarding growth in NaCl?
Vibrio:
+
in 0% NaCl,
+
in 6% NaCl
Aeromonas:
-
in 0% NaCl,
-
in 6% NaCl
Plesiomonas:
+
in 0% NaCl,
-
in 6% NaCl
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What is the only species in the genus Plesiomonas?
Plesiomonas shigelloides
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What is the mode of acquisition for Plesiomonas spp.?
Ingestion
of
undercooked oysters
,
clams
, and
shrimps
, and also
water
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What is the growth requirement for Plesiomonas spp.?
Minimum growth requirement of 8°C
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What is the microscopy characteristic of Plesiomonas spp.?
Gram-negative straight bacilli
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What is the appearance of Plesiomonas spp. colonies on BAP?
Shiny
,
opaque
,
smooth
, and
nonhemolytic
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What is the biochemical test result for Plesiomonas spp. regarding catalase?
Catalase
positive
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What is the TSI reaction for Plesiomonas spp.?
K/A,
(
-
)
gas
, (
-
)
H2S
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What are the antigenic structures of Plesiomonas spp.?
Somatic O
Flagellar H
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What are the general characteristics of Campylobacter spp.?
Motile
by a single
polar flagellum
,
non-sporeforming
, and grows in
5-10%
oxygen
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What is the significance of Campylobacter spp. in relation to
Guillain-Barre syndrome
?
It is the most recognized antecedent cause of
Guillain-Barre syndrome
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What type of bacteria are Campylobacter spp. in terms of oxygen requirement?
Microaerophilic
, except for
C. rectus
and
C. carvus
which are
strict anaerobes
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See all 130 cards
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