Lesson 5a: Erysipelothrix rhusiopathiae

Question 1

Erysipelothrix rhusiopathiae
General Description

Answer 1

• gram-positive, small rods, or filaments
• non-enrinched media
• small colonies, incomplete haemolysis in 48hrs
• H2s formed along stab line in triple sugar iron agar
• found in porcine tonsils
• causes swine erysipelas, turkey erysipelas, polyarthritis in lambs

Question 2

virulence factors of Erysipelothrix rhusiopathiae

Answer 2

capsules, enzymes, surface proteins

Question 3

are rarely isolated from chronically affected joints

Answer 3

E. rhusiopathiae

Question 4

diamond skin disease. subclinically infected carrier pigs are the main reservoir of infection.

Answer 4

swine erysipelas

Question 5

bacteria is in the blood. incubation period of 2-3 days. high mortality rate and abortion may occur to pregnant sows.

Answer 5

septicaemic form

Question 6

Pigs are febrile, depressed, and walk with a stiff, stilted gait or remain recumbent

Answer 6

septicaemic form

Question 7

or diamond skin form. with less severe systemic signs and lower mortality rates.

Answer 7

cutaneous form

Question 8

pigs are febrile, and cutaneous lesions progress to characteristic diamond-shaped erythematous plaques which is resolve within a week or may become necrotic and Slough off

Answer 8

cutaneous form

Question 9

common in older pigs, and present as stiffness, lameness, or reluctance to bear weight on affected limbs.

Answer 9

arthritic form

Question 10

are mild but can progress to erosion of articular cartilage with eventual fibrosis and ankylosis

Answer 10

joint lesion

Question 11

the least common form, with wart-like thrombotic masses usually on the mitral valves

Answer 11

vegetative endocarditis

Question 12

important disease in turkeys worldwide. can be excreted semen and cause death to turkey hens 4-5 days following artificial insemination

Answer 12

erysipelas in fowl

Question 13

causes non-suppurative polyarthritis in lambs, entry of infection may be thru the navel or thru docking or castration wounds

Answer 13

infection in sheeps

Question 14

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

Answer 14

erysipelas in chickens