Current Findings in the Regional Veterinary Laboratories October 2005 Cattle All regional laboratories reported a sharp increase in the number of bovine foetal submissions, with Salmonella dublin and Neospora caninum being the most commonly identified abortefacients. Kilkenny diagnosed enterotoxigenic colibacillosis in a one-day old calf. A one-month old calf submitted to Cork was found to have lung congestion, ulcerative colitis and gross lesions of septicaemia. Rhodococcus equi was isolated from the lungs. Parasitic bronchopneumonia was diagnosed by Dublin in a six-month old Friesian heifer calf that died suddenly after being moved between farms. Athlone reported patent hoose pneumonia with bullae and interstitial emphysema in a 10-month old heifer. There was a very severe gross infestation of airways with the parasites. Kilkenny diagnosed blackleg in two eight-month old weanlings. They were from a group of twenty, five of which had been found dead on the same day. Athlone reported choke in an 18-month old bullock, the third to die from a group of forty cattle. The cattle were on a diet of fodder beet and pulp (figure 1). Limerick examined an 18-month old bullock with a history of weakness and ataxia. A large abscess was found in the neck region that involved the atlanto-occipital joint and had extended into the meninges and brain stem. Lesions in the pharynx suggested that the problem began with foreign body penetration of the pharyngeal wall. Arcanobacterium pyogenes was isolated on culture. Athlone reported chronic pericarditis and epicarditis in a five-year old bull that had died after showing illness for only a few days. Histopathological examination of the cardiac muscle showed myopathy, myocarditis, fibrosis and haemorrhage. Athlone reported suspected aflatoxicosis in a sixyear old Charolais cow that had shown chronic ill-thrift over a period of months before death. Gross examination showed an enlarged, pale, fibrotic liver. The diagnosis of aflatoxicosis was reached following liver histopathology. Sheep Athlone reported rumenal acidosis in a group of 400 six-month old lambs. One lamb of a number that had died was presented for post-mortem examination. The rumen was engorged with grain, the pH of the contents was found to be 4.2, and zero protozoan motility was noted on microscopic examination of a rumenal fluid sample. Pigs Limerick diagnosed enterotoxigenic colibacillosis in a group of four-day old piglets. There was ninety per cent mortality in the litter involved. The Escherichia coli isolated was typed as O147. Weaner pigs with a history of pneumonia were submitted to Kilkenny. Pasteurella multocida was isolated from the lungs of one, and Actinobacillus pleuropneumoniae was isolated from four others. Cork isolated several bacterial pathogens from weaner pigs from one premises experiencing high mortality rates. Haemolytic Escherichia coli G205, Salmonella typhimurium and Salmonella london were isolated. Poultry Cork isolated Enterococcus faecalis (previously known as Streptococcus faecalis) from broiler breeder hens that had septicaemia and liver necrosis. Deaths ceased following medication with amoxycillin. Avian tuberculosis was identified by Cork in a small “back-yard” free-range flock. Other Species Euthanasia had been undertaken on an eight-month old foal that had presented clinically with severe colic. The foal was submitted to Cork where caecal torsion was found (Figure 2). An adult greyhound bitch with a history of dyspnoea was submitted to Limerick. The examination showed haemothorax as a result of a fracture to the proximal third of the 8th rib. A bone fragment had penetrated a blood vessel and the costal pleura. In the monthly report of September 2005, Kilkenny reported on a case of megaoesophagus in a seven-week old greyhound, one of four showing poor-thrive in a litter of eight. Another of the pups was presented this month, at nine weeks of age. Megaoesophagus was obvious again but in this case it was associated with persistent right aortic arch (figure 3). Salmonella dublin was also isolated on routine culture. In the former case, the whole of the thoracic oesophagus was dilated, in the latter only the oesophagus anterior to the heart was affected. Athlone reported high mortality in two litters of border collie pups. Viral enteritis was diagnosed with parvovirus being the most likely cause. In total, out of two litters of four, only one pup survived. A mute swan submitted to Cork had lesions consistent with a septicaemic condition. Erysipelothrix rhusopathiae was isolated from all organs cultured. Another mute swan examined by Cork had apparently died as a result of haemorrhage from a spontaneous liver rupture. There were no external signs of trauma. An African Grey parrot examined by Cork had aspergillosis, with pneumonic lesions predominant. Two coursing club hares submitted to Cork had died of yersiniosis. CAPTIONS FOR PHOTOS Figure 1 “Foreign body causing choke in an 18-month old bullock – photo John Fagan” Figure 2 “Caecal torsion in an eight-month old foal – photo Pat Sheehan” Figure 3 “Megaoesophagus and persistent right aortic arch in a nine-week old greyhound pup – photo Donal Toolan”