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BACTE LEC > ENTEROBACTERIACEAE PT.2 > Flashcards

ENTEROBACTERIACEAE PT.2 Flashcards

1
Q

this genus causes dysentry

A

Shigella

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2
Q

biochem inert of shigella

A

Non-lactose fermenters
Do not use acetate or mucate as carbon source

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3
Q

unique member of shigella

A

shigella sonnei

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4
Q

specie that is fragile and susceptible to
various effects of physical and chemical
agents

A

Shigella species

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5
Q

why shigella sonnei is unique?

A

Ability to ferment lactose slowly (LLF) producing pink colonies on MAC agar only after 8 hours of incubation

ONPG positive

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5
Q

t/f: Shigella are susceptible to the acid pH of
the stool.

A

t

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6
Q

what happens if k antigens are present

A

it interferes with o antigen in serologic grouping

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6
Q

what must be done in order to remove k antigen

A

boil the bacterial suspension for 30 minutes

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6
Q

shigella subgroup b (strong’s bacillus)

A

shigella flexneri

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6
Q

shigella subgroup a (dysentry bacillus)

A

shigella dysentriae

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6
Q

shigella subgroup c (shigella ambigua)

A

shigella boydii

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7
Q

shigella subgroup d

A

shigella sonnei

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7
Q

shigella specie that is predominant in the U.S and other industrialized countries

A

shigella sonnei

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7
Q

shigella species that are the most common isolates in developing countries.

A

shigella dysentriae type 1 and shigella boydii

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8
Q

reservoir of shigella

A

humans and large primates

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8
Q

mot of shigella

A

direct person-to-person contact
fecal-oral route
flies, fingers, food and water contaminated by infected persons

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8
Q

shigella specie that affects mostly young children. Leading isolate of gastroenteritis among men who have sex with men. HIV infections increases this risk.

A

shigella flexneri

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9
Q

shigella specie that remains the most virulence of all the species with a significantly high morbidity and mortality rate.

A

shigella dysentriae type 1

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10
Q

function of cell-to-cell passage

A

protects Shigella from immune-mediated clearance

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10
Q

enrichment medium for the isolation of Salmonella spp., and Shigella species from heavily contaminated specimens such as stool.

A

Selenite broth

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10
Q

function of IL1B

A

acts as a chemoattractant for PMNs into the infected tissues.

destabilizes the integrity of the intestinal wall and allows bacteria to reach the deeper epithelial cells.

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11
Q

what is the result if there are high contrentations of gb3

A

hemmorhagic diarrhea and hemolytic uremic syndrome

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11
Q

typically found in cold-blooded animals as well as in rodents and in birds, which serve as their natural hosts.

A

salmonella

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11
Q

H Ag

A

More stable
O and H are the primary antigenic structures

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11
Q

Fimbriae

A

for adhesion

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11
Q

O Ag

A

Stable to boiling and acid alcohol

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12
Q

Vi Ag

A

Plays a role in preventing phagocytosis

12
Q

also known as the Gardner’s bacillus

A

salmonella enteritidis

12
Q

also known as the Eberth’s bacillus

A

salmonella typhi

12
Q

what is rose-spots

A

blanching rose-colored papules around the umbilical region also appear during the second week of fever,

12
Q

diseases associated with salmonella

A

gastroenteritis or food poisoning
typhoid fever

12
Q

most severe form of enteric fever

A

Typhoid fever

12
Q

initially isolated from a lizard and is usually isolated from cold-blooded animals and the environment.

A

salmonella bongori

12
Q

salmonella spp that have no known animal reservoirs and infections only occurs in humans.

A

salmonella typhi
salmonella paratyphi

12
Q

other species that causes enteric fever

A

Salmonella Paratyphi A, B,and C
salmonella cholerasius

12
Q

during the first week of enteric fever where is the bacteria isolated?

A

isolated from blood

13
Q

can be used indefinitely as clinical specimen

A

Stool

13
Q

during the second and thrid week of enteric fever where is the bacteria isolated?

A

isolated from the stool

13
Q

colony characteristic in SSA

A

colorless-black center (H2S+)

13
Q

colony characteristic in EMB/MAC

A

colorless

13
Q

colony characteristic in NA

A

maple leaf colonies w/irregular margins

13
Q

colony characteristic in XLD

A

slightly pink to white opaque colonies

13
Q

qualitative in widal test

A

slide technique

14
Q

Serologic test that detects the presence of antibodies in the person’s serum against O and H antigens of Salmonella Typhi.

A

Widal Test

14
Q

what type of colony does salmonella typhi on bsa produce

A

Metallic colonies with a black ring

15
Q

titer of o agglutinins that is clinically significant as these indicate active infection.

A

1:100

16
Q

quantitative in widal test

A

tube technique

17
Q

titer of h agglutinins that is clinically significant as these indicate active infection.

A

1:200

17
Q

pathogens under yersinia

A

Yersinia pestis
Yersinia pseudotuberculosis
Yersinia enterocolitica

18
Q

causative agent of plague

A

Yersinia pestis

19
Q

Implicated in sporadic cases of gastroenteritis, mesenteric lymphadenitis especially in children, and generalized septicemic infections in immunocompromised hosts.

A

Yersinia pseudotuberculosis
Yersinia enterocolitica

20
Q

has been a cause of diarrhea outbreaks in numerous communities and it has been seen to mimic appendicitis.

A

Yersinia enterocolitica

21
Q

The causative agent of plague – a primary disease in rodents that are spread to humans by bites of fleas.

A

Yersinia pestis

22
Q

Parasite of the rodent of yersinia pestis

A

Rattus rattus

23
Q

flea vector (most common and effective vector
of Yersinia pestis)

A

Xenopsylla cheopis

24
Q

stain used in cells to have a characteristic “Safety Pin” appearance

A

Wayson Stain

25
Q

most common form of the disease, results from the bite of a flea, or by direct inoculation of an open skin would by plague-infected material.

A

Bubonic plague

25
Q

results from the hematogenous dissemination of the organism, following the damaged of the lymph nodes in patients with bubonic plague.

A

Secondary septicemic plague

26
Q

occurs in patients without buboes as primary infections.

A

Primary septicemic plague

27
Q

results form the dissemination of the organism to other organ systems such as the lungs, brain, liver, and spleen, with daysnear and hemoptysis, plague meningitis, and hepatic and splenic abscesses.

A

Secondary pneumonic plague

28
Q

yersinia specie that is found in a wide variety of animals, including domestic swine, cats, and dogs.

A

Yersinia enterocolitica

29
Q

mot of yersinia enterocolitica

A

contact with household pets

30
Q

used to increase the recovery in fecal samples.

A

Cold-enrichment

30
Q

Clinical manifestations of Yersinia enterocolitica

A

§ Acute gastroenteritis
§ Appendicitis – like syndrome
§ Less frequent manifestations such as septicemia,
arthritis, and erythema nodosum.

31
Q

yersinia specie that has the ability to survive in cold temperatures

A

Yersinia enterocolitica

32
Q

Similar to Yersinia pestis for being a disease primarily of rodents, particularly guinea pigs. And birds are natural reservoirs.

A

Yersinia pseudotuberculosis

BACTE LEC (7 decks)

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