Lesson 5a: Erysipelothrix rhusiopathiae

Question 1

Erysipelothrix rhusiopathiae causes:

Answer 1

1. swine erysipelas
2. turkey erysipelas
3. polyarthritis in lambs

Question 2

infection is usually aquired by ingestion of material contaminated by ?

Answer 2

pig faeces

Question 3

what are the virulence factor of erysipelothrix rhusiopathiae?

Answer 3

1. capsules
2. enzymes
3. surface proteins

Question 4

Localization of the bacteria in ______ and on _________ during haematogenous spread accounts for the development of chronic lesions at these sites.

Answer 4

joint synovia & heart valves

Question 5

________ are rarely isolated from chronically affected joints.

Answer 5

E. rhusiopathiae

Question 6

also known as diamond skin disease, subclinical infected carrier pigs are the main reservoir of this infection, pigs w/ acute disease excrete large number of organisms in faeces.

Answer 6

Swine erysipelas

Question 7

organism of swine erysipelas, are also excreted in the ?

Answer 7

urine, saliva, & nasal discharge

Question 8

protection against infection of swine erysipelas are due to?

Answer 8

1. maternally-derived antibodies (pigs under 3 months old)
2. exposure to strains of low virulence (pigs over 3 years old)

Question 9

to form of acute form in erysipelothrix rhusiopathiae

Answer 9

1. septicaemic form
2. cutanenous form

Question 10

in this form incubation period of 2 to 3 days.high mortality rate and abortion may occur to pregnant sows

Answer 10

Septicaemic form

Question 11

in septicaemic form pig are showing this behavior:

Answer 11

1. febrile
2. depressed
3. walk w/ a stiff
4. stilted gait or remain recumbent

Question 12

______ or diamond skin form, w/ less severe systemic signs & lower mortality rates, pigs are febrile & cutaneous lesion characterized to diamond-shape erythematous plaques

Answer 12

cutaneous form

Question 13

this form is common in older pigs & present stiffness, lameness or reluctant to bear weight on affected limbs.

Answer 13

Arthritic form

Question 14

this is the least common form, with wart-like thrombotic masses usually on the mitral valves, affected animals are asymptomatic but some developed Congestive heart failure or die suddenly if stressed by physical exertion or by pregnancy..

Answer 14

Vegetative endocarditis

Question 15

diagnosis of swine erysipelas;

Answer 15

diamond-shaped skin lesions are pathognomonic

Question 16

samples to be collected:

Answer 16

1. blood for heamoculture
2. post-mortem specimen of liver, spleen, heart valves or synovial tissue.

Question 17

what is laboratory technique use in s. erysipelas

Answer 17

Gram staining

Question 18

Bacterial culture isolation by s. erysipelas

Answer 18

Blood agar & MacConkey agar plates

Question 19

this test are not applicable for diagnosis in swine erysipelas ?

Answer 19

Serological test

Question 20

molecular detection used by s. erysipelas?

Answer 20

PCR

Question 21

treatment for s. erysipelas?

Answer 21

acute form: penicillin & tetracycline
chronic form; antibiotic therapy is ineffective

Question 22

control of s. erysipelas

Answer 22

1. strict hygiene & management practices
2. culling or isolation of affected pigs
3. vaccines are available but should not be administered

Question 23

important disease in turkeys worldwide, can be excreted in semen & caused death to turkey, hens 4-5 days ff. artificial insemination.It’s septicaemic w/ high mortality rates.

Answer 23

Erysipelas in fowl

Question 24

what is the characteristic of erysipelas in fowl:

Answer 24

dark-coloured, swollen snoods

Question 25

post-mortem findings of erysipelas in fowls?

Answer 25

enlarged friable live & spleen

Question 26

chronically affected birds of ersipelas fowl may exhibit?

Answer 26

1. arthritis
2. vegetative endocarditis
3. gradually lose weight
4. they become emaciated

Question 27

vaccination w/ an inactive vaccine stimulates?

Answer 27

protective immunity

Question 28

this disease can cause outbreaks of severe disease occasionally, with reported moratality rates up to 50%

Answer 28

Erysipelas in chicken

Question 29

this can cause non-suppurative polyarthritis in lambs,

Answer 29

infection in sheeps

Question 30

entry of infection of chickens may thru?

Answer 30

1. navel
2. docking
3. castrations

Question 31

the organism may contaminate dipping solution that can infect older lambs & adult sheeps thru skin aberations in the hoof region manifested by ?

Answer 31

cellulitis or lameness