Small Ruminants - Respiratory Dz Flashcards

1
Q

List neoplasias that have been reported to occur in the nasal passages of sheep and goats.

A
  • Adenopapillomas.
  • Adenomas.
  • Adenocarcinomas.
  • Squamous cell carcinomas.
  • Ovine/caprine adenocarcinoma virus.
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2
Q

Describe the type of virus, clinical signs and prognosis for small ruminants infected with the Ovine/Caprine Adenocarcinoma Virus.

A
  • Retrovirus.
  • Infected secretory epithelial cells of the nasal turbinates.
  • No breed/sex predilection.
  • Typically affects young adults.
  • Benign, locally invasive; eventually causes weight loss, asphyxia, secondary infection, death.
  • Dx: endoscopy, rads, PCR (serology not useful).
  • Surgical tx has been attempted but poor Px.
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3
Q

Describe the lifecycle of oestrus ovis.

A
  • Infects sheep more frequently than goats; occ infects other animals –> conjunctivitis in people.
  • Adult female fly lays 1st instar larvae near the nose of sheep, migrates to nasal and ethmoid turbinates.
  • 2nd instar larvae develops and migrates to sinus.
  • 3rd instar larvae migrates to nasal passages.
  • Sneezed onto ground –> pupate –> adult flies (active in warm months and climates).
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4
Q

Describe the clinical signs of oestrus ovis infection in sheep and goats.

A
  • Larvae irritate nasal passages/sinuses.
  • Mucoid-mucopurulent-blood-tinged nasal discharge.
  • Sneezing.
  • Nose rubbing.
  • Inspiratory stridor.
  • Adult flies annoy sheep, decrease productivity, predispose to secondary bacterial rhinitis, sinusitis, pneumonia.
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5
Q

Describe treatment and prevention of oestrus ovis infection.

A
  • Ivermectin after a frost (when adults are dead).

- Outside US: inj moxidectin and doramectin, pour on epinomectin.

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6
Q

Are there breed and sex predilections for development of laryngeal abscesses in sheep?

A
  • Rams > ewes.

- Texel and Southdown.

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7
Q

Describe the aetiology of laryngeal abscesses in ruminants.

A

FB, trauma or congenital cavitation in cartilage –> infection with T. pyogenes.

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8
Q

Describe the clinical signs and diagnosis of laryngeal abscesses in ruminants.

A
  • Alert, afebrile, eating well until terminal dyspnoea.
  • Tachypnoea.
  • Extension of head and neck.
  • Progressive dyspnoea.
  • Cyanosis.
  • Stertor.
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9
Q

Describe the treatment and prognosis of laryngeal abscesses in ruminants.

A
  • Tracheostomy.
  • PPG.
  • NSAID.
  • Px: guarded.
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10
Q

Ingestion of what plant by ewes can cause congenital tracheal stenosis in lambs?

A

Veratrum californicum at 31-33 days gestation –> rapid death of lambs after birth.

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11
Q

Do herpesviruses cause respiratory disease in small ruminants?

A

Importance of ovine and caprine herpesviruses in respiratory disease is unknown.

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12
Q

Do respiratory syncytial viruses cause respiratory disease in small ruminants?

A

Yes, there is an ovine respiratory syncytial virus and a caprine respiratory syncytial virus. No vacc available. CSx similar to cattle with BRSV.

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13
Q

Describe presentation of Ovine Adenovirus infections.

A

Causes mild respiratory and enteric disease in lambs.

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14
Q

What are the clinical signs of Mycoplasma mycoides ss mycoides (large colon type) infection in goats?

A
  • Adults: polyarthritis, mastitis, AIP +/- death.
  • Kids (2-8wks): high mortality:
    i) High fever, death in 12-24h.
    ii) CNS syndrome w opisthotonus and death in 24-72h.
    iii) Fever, swollen/painful joints, pneumonia, recumbency.
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15
Q

Describe necropsy findings in goats that have died of Mycoplasma mycoides ss mycoides (large colon type) infection.

A
  • Fibrinopurulent polyarthritis.
  • Pneumonia: patchy to diffuse red consolidation, bronchointerstitial pneumonia +/- fibrinous exudate +/- pleural effusion.
  • +/- pericarditis, peritonitis, enlarged liver/spleen/kidneys.
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16
Q

Describe diagnosis of Mycoplasma mycoides ss mycoides (large colon type) infection in goats.

A
  • Ear canal PCR identifies chronic carriers.

- Culture of milk, joint fluid, blood, urine or tissue.

17
Q

Describe treatment and prevention of Mycoplasma mycoides ss mycoides (large colon type) infection in goats.

A
  • ABs almost always unsuccessful (tylosin, tetracycline).
  • Kids that survive –> arthritis; does –> carriers.
  • Prevention: maintain MmmLC free herd; purchase does w no hx of kid deaths from pneumonia or arthritis and neg bulk tank +/- indv milk cultures.
  • Control in an outbreak: feed pasteurised goat or cow colostrum, pasteurised milk to 1mo, pasteurised milk/replace till weaning; cull kids w swollen joints.