Lesson 5a, 5b Flashcards
Erysipelothrix rhusiopathiae generally cause these diseases
- swine erysipelas
- turkey erysipelas
- polyarthritis
Infection of Erysipelothrix rhusiopathiae is through:
Ingestion of material contaminated by pig feces
E. rhusiopathiae localize in these areas
joint synovia, heart valves
Which disease form of swine erysipelas is manifested by depression, walk with a stiff, stilted gait or remain recumbent?
Septicemic form
Which disease form of swine erysipelas is manifested by diamond skin?
Cutaneous form
Name the two acute forms of swine erysipelas
Septicemia form
Cutaneous form
Which disease form of swine erysipelas is common in older pigs, and present as stiffness, lameness or reluctance to bear weight on affected limbs?
Arthritic form of erysipelas
The least common form of swine erysipelas with wart-like thrombotic masses usually on the mitral valves.
Vegetative endocarditis
Which heart valve is most commonly affected in cases of vegetative endocarditis?
Mitral valves
What is the pathognomonic (distinctive and characteristic) skin lesion associated with swine erysipelas?
Diamond-shaped skin
An important disease in turkeys worldwide that can be excreted in semen and cause death to turkey hens 4-5 days following AI
Erysipelas in fowl
Characterized by dark-colored, swollen snoods with post-mortem findings include enlarged friable livers and spleen:
Erysipelas in fowl
Pathogenic effects of Erysipelothrix rhusiopathia in sheeps through entry of navel or thru docking or castration wounds:
Non-supporative polyarthritis in lambs
Which Bacillus species is implicated in sporadic abortions in cattle and sheep?
Bacillus licheniformis
Bacteria characterized by 5 mm diameter, flat, dry, greyish and with a ‘ground glass’ appearance:
Bacillus anthracis
Similar morphology with B. anthracis but are larger and with greenish tinge
Bacillus cereus
colonies are dull, rough, wrinkled and strongly adherent to the agar that becomes brown with age
Bacillus licheniformis
curled outgrowths from the edge of the colony impart a characteristic ‘medusa head’ appearance
Bacillus anthracis
Clinical manifestation of cattle and sheep by B. anthracis
Fatal peracute or acute septicaemic
anthrax
What does B. anthracis produce during necropsy especially with bloated animal?
Spores (endospores)
Clinical manifestation of horses by B. anthracis
Subacute anthrax with localized edema;
septicemia with colic and enteritis
sometimes occurs
Clinical manifestation of Bacillus cereus in cattle
Mastitis
Clinical manifestations of B. licheniformis to cattle and sheep
Sporadic abortion
Which Bacillus species cause abortion in cattle and sheep associated with the feeding of contaminated silage or moldy hay?
B. licheniformis
Species moderately susceptible to anthrax:
Pigs
Horses
Species resistant to anthrax:
Carnivores
Birds
encodes for exotoxin (protective antigen, edema factor and lethal factor)
Plasmid PXO1
encodes for capsule of Bacillus sp.
PXO2
Anthrax in pigs are manifested by:
Edematous swelling of the throat and head along with regional lymphadenitis
Why are birds resistant to anthrax?
High body temperatures
Species susceptible to anthrax:
ruminants
Carcasses of animals suspected of anthrax exhibit these characteristics:
- absence/incomplete rigor mortis
- bloated
- Dark, unclotted blood in orifices
This bacteria form small colonies, with incomplete haemolysis in 48 hours
Erysipelothrix rhusiopathiae
What characteristic is observed in triple sugar iron agar that suggests the presence of Erysipelothrix rhusiopathiae?
Hydrogen sulfide formation
