FASH11: Respiratory Disease of Growing Lambs Flashcards
What are the agents that cause pasteurellosis?
Mannheimia haemolytica
Bibersteinia trehalosi
Pasteurella multocida
What three conditions is M. haemolytica related to?
Septicaemia in young lambs
Pneumonia in growing lambs
Mastitis in ewes
Describe the pathology of pneumonic pasteurellosis.
Ecchymotic haemorrhages over the throat and over the ribs
Lungs are swollen and purple-red and the airways contain pink stained froth
Describe the pathology of septicaemic pasteurellosis.
Pleurisy and pericarditis, with petechiae in the myocardium, spleen, liver, and kidney, enlarged lymph nodes and hepatic fatty change
Describe the epidemiology of M. haemolytica.
Occurs sporadically or as a flock outbreak. Ewes and lambs may be affects
Sudden death often seen first
Other animals then follow with pneumonia
How do you treat m. haemolytica?
Oxytetracycline or tilmicosin
NSAIDs
Is treatment of M. haemolytica the best option?
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
Best way to prevent infection by m. haemolytica?
Vaccination with modern iron regulation protein
Booster before lambing for passive immunity
What diseases are caused by pasteurella trehalosi?
Systemic pasteurellosis
What is the most common diagnosed cause of sudden death in lambs between july and december?
systemic pasteurellosis
What are outbreaks of systemic pasteurellosis followed from?
Movement of lambs onto rape, turnips, or improved pastures
How does p. trehalosi gain entry?
GI erosions and ulcers caused by dietary change
How do you treat systemic pasteurellosis?
Oxytetracycline
How do you control systemic pasteurellosis?
Vacciantion
Infection with parainfluenza virus type 3 predisposes them to what?
M. haemolytica
What is the agent of atypical pneumonia?
Mycoplasma ovipneumoniae
How do you treat atypical pneumonia?
Oxytetracycline
How do you control against atypical pneumonia?
- Improve ventilation
- reduce stocking densities
- avoid shared airspace with older sheep
- isolation of purchased lambs
- vaccination against pasteurellosis
What animals are more susceptible to developing laryngeal chondritis?
Texel and Suffolk
Short neck confirmation with trauma/ dust/infection
How do you treat laryngeal chondritis?
Steroid IV or antibiotic (penicillin)
What develops following pneumonic pasteurellosis or atypical pneumonia?
Chronic suppurative pneumonia
How does chronic suppurative pneumonia develop?
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.
How do you treat chronic suppurative pneumonia?
penicillin
