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Sac C Vs Disease Surveillance Report
Ectrodactyly in Limousin calves

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  • Ectrodactyly in Limousin calves

  • Differing presentations of bovine malignant catarrhal fever

  • Bovine abortion due to Bacillus licheniformis

  • Bovine colostrum-associated anaemia in lambs

  • Doramectin toxicity in a collie dog

These are among matters discussed in the disease surveillance report for March 2017 from SAC Consulting: Veterinary Services (SAC C VS)

March in Scotland was changeable with both bright and showery conditions. The mean temperature was 1.3°C above the long-term average and rainfall was 91 per cent of average overall. It was generally sunny with 133 per cent of average overall, the sixth sunniest since 1929.

Cattle

Generalised and systemic conditions

SAC C VS diagnosed malignant catarrhal fever (MCF) in three animals in March, each with distinctly different clinical presentations.

Perth diagnosed MCF in a 20-month-old Belgian blue bullock, from a group of 50. It was off its food, pyrexic and had a serous eye and nasal discharge. The animal was euthanased for postmortem examination, which revealed enlarged congested lymph nodes throughout the carcase. There was froth in the trachea and marked congestion of the mucosa of the trachea and bronchi and of the abomasum and intestine.

Histopathological examination revealed intense multisystemic lymphocytic angiocentric inflammation, particularly of the nares, trachea and lung (Fig 1), as well as renal lymphocytic vasculitis. A severe non-suppurative choroid plexitis and moderate widespread non-suppurative meningitis and angiocentric encephalitis, typical of MCF, were also present. MCF was confirmed by detection of ovine herpesvirus type 2 (OvHV-2) DNA.

FIG 1:

Angiocentric non-suppurative pneumonia in a bullock with malignant catarrhal fever. An abundant dense perivascular infiltrate of pleomorphic mononuclear cells (arrows), including lymphocytes, can be seen

This was an unusual case in that the presenting clinical signs were predominately respiratory. There was no immediate history of close contact with sheep, but the incubation period of MCF can be variable, ranging from 10 days to several months and …

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