Week of 22-Sep-2017
What is the likely cause of this lesion seen in >10% of lungs in slaughter pigs each week from a breeder feeder farm?
The incised lesion shown is typical of a long standing infection with Actinobacillus pleuropneumoniae (App) infection in the diaphragmatic lobes of the lung. Pleural tags will be evident above the lesion.10% prevalence in weekly batches suggests enzootic disease within the herd and it is likely that it will be acting to limit performance and be part of a wider respiratory picture. Pleurisy levels at slaughter will also tend to be high with implications for trimming and carcass rejection.
Pasturella and Trueperella are both capable of producing abscessation in lungs but are typically secondary pathogens causing wet abcesses with lower prevalence. They are not typically associated with overlying localised pleurisy.
These dry lesions can surprisingly often yield cultures of App confirming the diagnosis.
Control of such disease at a herd level is best achieved by vaccination of young growing pigs either with a polyvalent commercial vaccine or using an autogenous vaccine derived from one or more isolates from the affected pigs.
Long term use of antibiotics to control chronic App infection on farm is no longer regarded as an acceptable option.
Week of 20-Oct-2017
There is scour, ill thrift and high mortality during the first 8 weeks post-weaning. All post-mortemed pigs had the same gross lesions, as the one seen in the picture. What is the most likely cause of this lesion?
Week of 13-Oct-2017
The unit has an increase of coughing and poor growth rates. What is the most likely cause of this lesion?
Week of 06-Oct-2017
There is an increase of ill thrift and laboured abdominal breathing in the weaners. There were poor response to antimicrobial treatment. Mortality ranges from 6 to 15%. What is the most likely cause of this lesion?
Week of 15-Sep-2017
The ulcer shown is in the preputial diverticulum of an adult boar culled due to persistent haemorrhage in the ejaculate. What is the likely cause?
Week of 08-Sep-2017
This non-fatal scour is seen in piglets from 10 days of age. What is the most likely primary cause?
Week of 01-Sep-2017
Which infectious disease is the most likely cause of the haemorrhages visible on the serosal surfaces of this growing pig which was found dead?