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Ahvla Disease Surveillance Report
Ampicillin-resistant Actinobacillus pleuropneumoniae in pigs

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  • Ampicillin-resistant Actinobacillus pleuropneumoniae causes pleuropneumonia in a pig herd

  • Chlamydophila abortus the most common diagnosis as the cause of abortion in ewes

  • Bibersteinia infection in a calf with concurrent salmonellosis

  • Respiratory cryptosporidiosis in free-living red grouse

  • Megaoesophagus diagnosed in a parma wallaby

These are among matters discussed in the Animal Health and Veterinary Laboratories Agency's (AHVLA's) disease surveillance report for March


Reproductive diseases


Most laboratories reported several cases of abortion due to pathogens associated with poor-quality silage. Penrith diagnosed Listeria monocytogenes infection as the cause of a sporadic bovine abortion in a dairy herd in which poor-quality silage was being fed. Fungal abortion and abortion due to Bacillus licheniformis was again commonly diagnosed. Conditions for silage making in 2011 were poor and quality can deteriorate over time, with the last silage to be fed being the most contaminated. This poses a particular risk to pregnant animals and such silage should not be fed to them.

Enteric diseases

Penrith investigated poor dietary management in a group of five-month-old calves from an organic dairy herd, resulting in weakness and poor condition. Postmortem examination of one revealed a large amount of dry, partially impacted forage in the rumen, reticulum and omasum. Intestinal contents contained incompletely digested forage. No lesions or deficiencies were detected and it was thought that the digestive dysfunction was possibly related to the feeding of dairy cow cake to the calves from a young age. It was recommended that this be stopped as potentially it provided calves with excess copper, excess fibre, and starch and protein of inadequate quality. Forage was also of poor quality. Advice was given on nutritional requirements.

Winchester diagnosed concurrent infection with Salmonella Dublin and Bibersteinia trehalosi in a two- to three-week-old calf from a small dairy herd, with a history of a relatively low incidence of calf mortality and …

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