This clinical case study tracks the long term pattern and control of Actinobacillus pleuropneumoniae (App) disease in a breeder feeder farm through the 1990’s.
We are called because of sudden deaths in several integrated fattening farms.
In May 2013 a sow farm in Indiana (USA) broke with PEDv. In mid March 2014, scour were observed in the onsite nursery and finisher. In the subsequent week, PEDv was diagnosed of the same strain (99.9 % homology) and the virus moved into the farrowing house.
Well intentioned treatment of piglets at birth may adversely affect the normal early nasopharyngeal or tonsil colonisation making pigs vulnerable to respiratory infections due to potential pathogens present within the herd.
Fertility problems with variable reproductive performances were detected. Also, ear and tail necroses appear in nurseries, and continuous diarrhoea cases and rectal prolapses in the fattenings.
In the last 4 batches of weaned piglets, the farmer saw around 3% of anorexic and lethargic piglets. All the treatments he tried failed (amoxicillin or florfenicol injections), and finally the piglets died.
After the clinical and serological evaluation it is decided to vaccinate against PRRSV, with which we achieve a gradual improvement in the health status on the farm. Some months later, a severe cough appears in the fattening pigs that later also appears in the nursery and in the sows.
The veterinarian is called from a new established herd in Brittany because some clinical signs appear on gilts from the two first deliveries introduced in the farm.
Frequent deaths and cases of disease with typical “diamond-skin” lesions appeared in fattening pigs although they were vaccinated against Erysipelothrix rhusiopathiae.
There is an unusual increase of the returns-to-oestrus at 31-39 days. The majority are due to sows previously negative to the pregnancy ultrasound testing, and the returns-to-oestrus happened before 42 days.