Yersinia

Question 1

Gram stain

Answer 1

Gram negative

Question 2

Morphology

Answer 2

Rod shaped, bipolar stain look like safety pin

Question 3

Oxygen requirements

Answer 3

Facultatively anaerobic

Question 4

Do the ferment lactos

Answer 4

no

Question 5

Y. pestis disease

Answer 5

Plague

Question 6

Y. Pseudotuberculosis

Answer 6

Enterocolitis and mesenteric lymphadenitis in birds, rodents, and sometimes domestic animals. Generalized nodular abscesses

Question 7

Y. enterocolitica disease

Answer 7

Enterocolitis and mesenteric lymphadenitis in humans and domestic animals. Foodbourne pathogen

Question 8

Habitat of enterocolitica and pseudotuberculosis

Answer 8

GI tract and lymph nodes especially pigs (enterocolitica)

Question 9

Lymph nodes and lymphoid tissue trophism

Answer 9

-Y. pestis: site of entry
-Y. pseudotuberculosis and entercolitica: Peyers patches and mesenteric lymph nodes

Question 10

Habitat of pestis

Answer 10

Rodents, rabbits, squirrels, prairie dogs and others in sporadic pockets in US and europe and asia

Question 11

Modes of infection of plague

Answer 11

-Flea bites
-Inhale aerosols
-Contact with infected person or dead animals
-Cat bites
-Ingestion (in cats)

Question 12

Sylvatic plague

Answer 12

Plague in rodents where they serve as maintenance hosts and transmitted by fleas. Source of infection to animals and humans

Question 13

Virulence factors of pestis

Answer 13

-Fraction 1 protein capsular
-Capsule
-LPS
-Yersiniobactin: siderophore
-Toxins

Question 14

Toxins in pestis

Answer 14

-Yops
-LerV
-Murine toxin
-Pesticin
-Coagulase

Question 15

Plague in domestic animals

Answer 15

Cats highly susceptible. Other animals may get infected by flea bites or eating forages by contaminated rodents
-Dogs get infected but no clinical signs

Question 16

Forms of feline plague

Answer 16

-Bubonic
-Speticemic
-Pneumonic

Question 17

Clinical signs of feline plague

Answer 17

-Fever, depression, and anorexia
-Swollen lymph nodes (submandibular)

Question 18

Treatment of feline plague

Answer 18

Bubonic may respond
-Aminoglycosides
-Tetracyclines
-Chloramphenicol

Question 19

Enteric yersiniosis

Answer 19

More common in sheep, goats, and cattle
-Frequently isolate from feces of normal animals

Question 20

Clinical signs of enteric yersiniosis

Answer 20

-Diarrhea
-Jejunum and ileum most frequently affected
-May become systemic

Question 21

Incubation of Y. enterocolitica

Answer 21

24-36 hrs

Question 22

Signs of Y. enterocolitica

Answer 22

-Abdominal pain
-Fever
-Headache
-Vomiting
-Diarrhea
-Severe in younger people

Question 23

Food bourne pathogens

Answer 23

1. Staphylococcus aeurus
2. STEC O157:H7
3. Salmonella enterica
4. Yersinia enterocolitica

Question 24

Y. ruckeri

Answer 24

Fish pathogen causing red mouth disease.
-Subcutaneous hemorrhage around the mouth

Question 25

Enterobactericea resistent

Answer 25

Resistant to carbpenems and other antimicrobials

Question 26

Mechanisms of enterobactiericea

Answer 26

1. Carbapenemase
   -Beta lactamase enzymes

Question 27

Y. enterocolitica special characteristic

Answer 27

Psychrotroph grow well in cold