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Increase in diagnoses of ovine pulmonary adenocarcinoma in sheep in Scotland

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SRUC VS disease Surveillance headlines, January 2019

  • Abortion in cattle due to feed-associated organisms.

  • Peak in ovine pulmonary adenocarcinoma diagnoses in sheep.

  • Streptococcus suis serotype 1 as a cause of periweaning mortality in pigs.

  • Chronic amyloidosis in a gyr falcon (Falco rusticolus).

The mean temperature in Scotland in January 2019 was 0.1°C above the 1981 to 2010 long-term average. It was a very dry month, with Scotland as a whole having only 58 per cent of average rainfall and 120 per cent of average sunshine. Parts of the north were the exception, with dull conditions and near-average rainfall.

Cattle

Generalised and systemic conditions

Dumfries diagnosed Salmonella enterica serovar Mbandaka infection in a dairy herd. S Mbandaka was cultured from the faeces of four cows with diarrhoea and milk drop, and also from a pooled faecal sample from healthy animals. It had been isolated from a number of previous clinical cases from this farm.

SRUC VS commented that although S Mbandaka is capable of causing disease, it has a low virulence and it is likely that host factors trigger clinical disease; for example, concurrent intestinal or immunosuppressive disease, nutritional issues or stress. Screening of the bulk tank for bovine viral diarrhoea virus (BVDV) by PCR proved negative, but continued monitoring was advised as severe clinical disease has been seen in herds experiencing active circulation of BVDV.

Fetopathy due to BVDV has since been confirmed in this herd.

S Mbandaka does not provoke a good immune response, so it can sometimes persist indefinitely in dairy herds

S Mbandaka does not provoke a good immune response, so it can sometimes persist indefinitely in dairy herds, especially in those that buy in cattle. It is a common contaminant of vegetable proteins used in total mixed rations so it could be continuously reintroduced into herds. UK isolates have been shown to be capable of utilising metabolites …

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