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Opthalmology > Bovine > Flashcards

Bovine Flashcards

1
Q

What pathogen causes IBK?

A

Moraxella bovis +/- mycoplasma

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2
Q

What transmits IBK?

A

Vectors - flies

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3
Q

What are the main clinical signs of IBK?

A 
Lacrymation
Blepharospasm
Red eye
Keratitis - progressive ulceration
Pannus
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4
Q

What pathogen/ pathogenesis may be associated with silage eye?

A

Listeria/ hypersensitivity

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5
Q

Which breed is associated with SCC of the eye?

A

Hereford

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6
Q

What pathogen is associated with malignant catarrhal fever?

A

OvHV-2

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7
Q

What clinical signs are associated with MCF?

A 
Pyrexia
Depression
Nasal and mouth ulcers
Conjunctivitis/ oedema/ blepharospasm
Resp and GI signs
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8
Q

What pathogen is associated with IBR?

A

BoHV-1

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9
Q

What clinical signs are associated with IBR?

A

Pyrexia
Conjunctivitis
Nasal discharge/ resp signs
Corneal oedema

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10
Q

What clinical signs are associated with listeriosis?

A

Cranial nerve 5 and 7 damage

1) facial nerve paralysis, ear droop
2) Reduced menace response
3) Also encephalitis - circling & depression

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11
Q

What therapies can be used to treat listeriosis?

A

Oxytetracycline or penicillin

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12
Q

What ocular lesions are associated with BVD?

A

Congenital cataracts

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13
Q

What ocular lesions may be associated with sepsis?

A

Hypopyon/ petechiae

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14
Q

What ocular lesions are associated with endotoxaemia

A

Petechial/ chemosis

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15
Q

What ocular signs are associated with dehydration?

A

Sunken eyes

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16
Q

What ocular lesions are associated with bracken poisoning?

A

Hyphaema

17
Q

What mineral deficiency is associated with neurological deficits - nystagmus, convulsions and opitothonus?

A

Thiamine - CCN

18
Q

What mineral deficiency is associated with night blindness?

A

Vitamin A - retinol

19
Q

What treatment/ preventative measures can be used against IBK?

A

Moraxella is a gram-ve bacteria:

1) Systemic antibiotics - Macrolides, oxytetracycline and florfenicol.
2) Ointment - cloxacillin
3) Prevention - Isolation of affected animals

20
Q

When is IBK most commonly seen?

A

Summer. autumn - due to increased numbers of fly vectors. Increased dust causing irritation of the cornea.

21
Q

How does Moraxella cause damage to the cornea?

A

Releases beta-haemolysins which degrade corneal epithelium.

22
Q

Pink eye

A

Moraxella bovis - IBK

23
Q

Blue eye

A

MCF - corneal oedema

24
Q

Which opthalmic virus can recrudesce with stress and cause abortions?

A

IBR - BoHV-1

25
Q

How is listeria transmitted to the brain?

A

Retrograde transmission up nerve axons!

26
Q

What lesions may be seen with cases of BVD?

A

Cataracts

Opthalmology (3 decks)

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