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Infection & Immunity 2 > Enteric Gram -ve Bacteria Part II > Flashcards

Enteric Gram -ve Bacteria Part II Flashcards

1
Q

Natural habitat of samonella

A

GIT of warm and cold blooded animals

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2
Q

List host adapted species of Salmonella serovars

A

Abortus equi

Abortus ovis

Cholerasuis

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3
Q

Non host adapted salmonella serovars

A

Newport

Anatum

Typhimurium

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4
Q

Factors responsible for development of infection by salmonella serovars

A

Species, serovar type, host’s immune status, and Infectious dose

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5
Q

Pathogenesis of salmonellosis

A
  • ingestion
  • adhesion -> intestinal epith.
  • salmonella invades M cells of peyer’s patches in small intest. And epithelium
  • engulfment

Orrrrr

  • dendritic cells uptake salmonella from submucosa
  • scv replicates in cytoplasm
  • scvs transcytose salmonella -> submucosa
  • phagocytes in scv internalize bact.
  • septicemia
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6
Q

Most common intestinal lesions of salmonella in cows and pigs?

A

Fibrinosuppressive, necrotizing, and hemorrhagic inflammation of distal SI and Lg bowel

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7
Q

Serovars most commonly isolated from cattle

A

S. Dublin, S. Typhimurium, and S. Newport

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8
Q

Age range of cattle dev. Neonatal diarrhea due to salmonellosis compared to colibacillosis?

A
  • salmonellosis: 5-14 days
  • colibacillosis: 1-5 days
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9
Q

Serovars primarily isolated from pig salmonellosis

A

S. Typhimurium and S. Cholerasuis

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10
Q

Predisposing salmonellosis factors in horses

A
  • colic, GI surgery, and antimicrobial agents
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11
Q

Common salmonellosis isolates in horses

A

S. Typhimurium and S. Anatum

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12
Q

Host adapted salmonellosis isolate in horses

A

Abortus equi

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13
Q

2 non-motile salmonellosis serovars that don’t have peritrichious flagella

A

S. Gallinarum and S. Pullorum

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14
Q

Name of disease caused by motile serovars of salmonella in 1st 2wks of a chicken’s life

A

Paratyphoid

(Presents as septicemia)

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15
Q

Age group of chickens affected by pullorum disease

A

First 2-3wks of life

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16
Q

Means of eradication of pullorum disease

A

Culling?

17
Q

Is pullorum disease vertical or horizontal transmission?

A

Vertical

18
Q

Causative salmonella of pullorum disease is

A

S. Pullorum

19
Q

Disease caused by S. Gallinarum

A

Fowl typhoid

20
Q

Age group fowl typhoid disease affects

A

Adults

21
Q

How do competitve flora reduce salmonella infections

A
  • compete for nutrients
  • mask receptors
  • produce toxic compounds
22
Q

Colony morphology of salmonella on macconkey and XLD agar

A
  • macconkey: straw/yellow color b/c non fermenter
  • XLD: colonies prod. H2S (so black)?
23
Q

How do you control salmonellosis in a herd?

A
  • enteric type: nursing care
  • septicemic type: nursing care + antibiotics
24
Q

How do you treat salmonellosis

A

Admin. a serum w/ antibodies to core LPS (endotox.)

25
Q

4 names of important yersinia species and their respective diseases

A
  • y. Pestis (bubonic plague & septcemia plague)
  • y. Pseudotuberculosis (pseudotuberculosis)
  • y. Entericolita (food borne illness)
  • y. Ruckeri (red mouth disease)
26
Q

Animal that is highly susceptible to the plague is

A

Cats

27
Q

Clinical signs of a cat infected w/ y. Pestis

A

Nodular necrosis, hemorrhage, edema, fibrin, and acute necrotizing inflamm.

28
Q

What plays an important role in the epidemiology of the plague and how are humans infected?

A
  • rats have an important role
  • humans get the plague from fleas, aerosols, or cats
29
Q

Which animal is the most important reservoir for y. Entericolitica

A

Pigs

30
Q

Major steps in control of the plague

A
  • rapid antibiotic therapy
  • hospitalize pneumonic animals
  • flea and rodent control in endemic areas
  • F1 and V subunit vx
31
Q

Major steps in controlling y. Entericolitica

A
  • cleaning and cooking pork intestine
32
Q

What feature makes klebsiella unique compared to other enterobacteriaceae species

A
  • prod. Mucoid colonies indicative of capsule production
33
Q

What attributes to hte mucoid colony morphology of klebsiella?

A

Lactose prod?

34
Q

Major reservoir of klebsiella in dairy cattle

A

Udders and teats

35
Q

How to prevent or control klebsiella infect.

A
  • don’t use sawdust or wood shavings as bedding
  • increase handwashing and sterilization
36
Q

Is klebsiella an important noscomical bacteria?

A

Yes

37
Q

What antibiotic is klebsiella resistant to

A

Beta lactamase

Infection & Immunity 2 (24 decks)

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