Lesson 5a: Erysipelothrix rhusiopathiae Flashcards
Erysipelothrix rhusiopathiae causes:
- swine erysipelas
- turkey erysipelas
- polyarthritis in lambs
infection is usually aquired by ingestion of material contaminated by ?
pig faeces
what are the virulence factor of erysipelothrix rhusiopathiae?
- capsules
- enzymes
- surface proteins
Localization of the bacteria in ______ and on _________ during haematogenous spread accounts for the development of chronic lesions at these sites.
joint synovia & heart valves
________ are rarely isolated from chronically affected joints.
E. rhusiopathiae
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.
Swine erysipelas
organism of swine erysipelas, are also excreted in the ?
urine, saliva, & nasal discharge
protection against infection of swine erysipelas are due to?
- maternally-derived antibodies (pigs under 3 months old)
- exposure to strains of low virulence (pigs over 3 years old)
to form of acute form in erysipelothrix rhusiopathiae
- septicaemic form
- cutanenous form
in this form incubation period of 2 to 3 days.high mortality rate and abortion may occur to pregnant sows
Septicaemic form
in septicaemic form pig are showing this behavior:
- febrile
- depressed
- walk w/ a stiff
- stilted gait or remain recumbent
______ or diamond skin form, w/ less severe systemic signs & lower mortality rates, pigs are febrile & cutaneous lesion characterized to diamond-shape erythematous plaques
cutaneous form
this form is common in older pigs & present stiffness, lameness or reluctant to bear weight on affected limbs.
Arthritic form
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..
Vegetative endocarditis
diagnosis of swine erysipelas;
diamond-shaped skin lesions are pathognomonic
samples to be collected:
- blood for heamoculture
- post-mortem specimen of liver, spleen, heart valves or synovial tissue.
what is laboratory technique use in s. erysipelas
Gram staining
Bacterial culture isolation by s. erysipelas
Blood agar & MacConkey agar plates
this test are not applicable for diagnosis in swine erysipelas ?
Serological test
molecular detection used by s. erysipelas?
PCR
treatment for s. erysipelas?
acute form: penicillin & tetracycline
chronic form; antibiotic therapy is ineffective
control of s. erysipelas
- strict hygiene & management practices
- culling or isolation of affected pigs
- vaccines are available but should not be administered
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.
Erysipelas in fowl
what is the characteristic of erysipelas in fowl:
dark-coloured, swollen snoods
post-mortem findings of erysipelas in fowls?
enlarged friable live & spleen
chronically affected birds of ersipelas fowl may exhibit?
- arthritis
- vegetative endocarditis
- gradually lose weight
- they become emaciated
vaccination w/ an inactive vaccine stimulates?
protective immunity
this disease can cause outbreaks of severe disease occasionally, with reported moratality rates up to 50%
Erysipelas in chicken
this can cause non-suppurative polyarthritis in lambs,
infection in sheeps
entry of infection of chickens may thru?
- navel
- docking
- castrations
the organism may contaminate dipping solution that can infect older lambs & adult sheeps thru skin aberations in the hoof region manifested by ?
cellulitis or lameness
