FASH11: Respiratory Disease of Growing Lambs

Question 1

What are the agents that cause pasteurellosis?

Answer 1

Mannheimia haemolytica

Bibersteinia trehalosi

Pasteurella multocida

Question 2

What three conditions is M. haemolytica related to?

Answer 2

Septicaemia in young lambs

Pneumonia in growing lambs

Mastitis in ewes

Question 3

Describe the pathology of pneumonic pasteurellosis.

Answer 3

Ecchymotic haemorrhages over the throat and over the ribs

Lungs are swollen and purple-red and the airways contain pink stained froth

Question 4

Describe the pathology of septicaemic pasteurellosis.

Answer 4

Pleurisy and pericarditis, with petechiae in the myocardium, spleen, liver, and kidney, enlarged lymph nodes and hepatic fatty change

Question 5

Describe the epidemiology of M. haemolytica.

Answer 5

Occurs sporadically or as a flock outbreak. Ewes and lambs may be affects

Sudden death often seen first

Other animals then follow with pneumonia

Question 6

How do you treat m. haemolytica?

Answer 6

Oxytetracycline or tilmicosin

NSAIDs

Question 7

Is treatment of M. haemolytica the best option?

Answer 7

Not necessarily

A decision must be made whether to gather and treat the lambs during an outbreak since handling for treatment may trigger further deaths/disease, and most acute mortality often occurs in the first day or two of the outbreak

Question 8

Best way to prevent infection by m. haemolytica?

Answer 8

Vaccination with modern iron regulation protein

Booster before lambing for passive immunity

Question 9

What diseases are caused by pasteurella trehalosi?

Answer 9

Systemic pasteurellosis

Question 10

What is the most common diagnosed cause of sudden death in lambs between july and december?

Answer 10

systemic pasteurellosis

Question 11

What are outbreaks of systemic pasteurellosis followed from?

Answer 11

Movement of lambs onto rape, turnips, or improved pastures

Question 12

How does p. trehalosi gain entry?

Answer 12

GI erosions and ulcers caused by dietary change

Question 13

How do you treat systemic pasteurellosis?

Answer 13

Oxytetracycline

Question 14

How do you control systemic pasteurellosis?

Answer 14

Vacciantion

Question 15

Infection with parainfluenza virus type 3 predisposes them to what?

Answer 15

M. haemolytica

Question 16

What is the agent of atypical pneumonia?

Answer 16

Mycoplasma ovipneumoniae

Question 17

How do you treat atypical pneumonia?

Answer 17

Oxytetracycline

Question 18

How do you control against atypical pneumonia?

Answer 18

• Improve ventilation
• reduce stocking densities
• avoid shared airspace with older sheep
• isolation of purchased lambs
• vaccination against pasteurellosis

Question 19

What animals are more susceptible to developing laryngeal chondritis?

Answer 19

Texel and Suffolk

Short neck confirmation with trauma/ dust/infection

Question 20

How do you treat laryngeal chondritis?

Answer 20

Steroid IV or antibiotic (penicillin)

Question 21

What develops following pneumonic pasteurellosis or atypical pneumonia?

Answer 21

Chronic suppurative pneumonia

Question 22

How does chronic suppurative pneumonia develop?

Answer 22

Occurs when pockets of bacterial infection persist and are walled off as chronic abscesses in the lung tissue or pleural space.

It may also be caused by bacteraemia spread from a septic focus.

Question 23

How do you treat chronic suppurative pneumonia?

Answer 23

penicillin