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Bovine spongiform encephalopathy was not confirmed histologically in 225 of 829 bovine brains submitted for diagnosis. Several previously described disorders of the central nervous system were observed in these brains as well as disorders not previously recognised in Britain, including bilateral vacuolation of the substantia nigra, hippocampal sclerosis with brainstem neuronal chromatolysis and necrosis, focal symmetrical encephalomalacia and meningio-angiomatosis. Severe cerebellar dysplasia consistent with pre-natal bovine viral diarrhoea--mucosal disease virus infection or mineralisation of the blood vessels of the basal ganglia were interpreted respectively as congenital changes or changes due to ageing and were considered to be of no clinical significance.
Vet Rec 1992 Oct 10
PMID:A neuropathological survey of brains submitted under the Bovine Spongiform Encephalopathy Orders in Scotland. 144 Nov 43

Some of the brains submitted for neurohistopathological examination under the Bovine Spongiform Encephalopathy (BSE) Orders did not show lesions of BSE. They showed neuronal chromatolysis and necrosis of the brainstem, perivascular cuffs and meningeal infiltrates of mononuclear cells and large irregularly shaped vacuoles in the neuropil. About half of them also showed loss of pyramidal neurons in the hippocampus, with astrocytic gliosis. The topography of the brainstem neuronal degeneration and vacuolation was the same in all the cattle, suggesting that neuronal necrosis and chromatolysis, vacuolation and hippocampal sclerosis are part of a spectrum of changes common to a single disease. The cows affected with such changes came from most parts of Scotland with the largest number from the north east. They were of various breeds, mostly suckler cows, and were aged from six to 16 years. Some cows had had no reported access to feed supplements. Clinically, the cows showed a range of neurological signs: tremor, ataxia, apprehension and weight loss were described in more than 80 per cent of the cases. The cause of the disorder was not determined.
Vet Rec 1992 Oct 17
PMID:Idiopathic brainstem neuronal chromatolysis and hippocampal sclerosis: a novel encephalopathy in clinically suspect cases of bovine spongiform encephalopathy. 891 15

Bovine spongiform encephalopathy probably results from the use of commercial diets containing scrapie-contaminated ingredients. Of all the chemical and physical decontamination procedures which are effective against conventional viruses, only high temperature autoclaving, high concentrations of sodium hypochlorite, and possibly molar sodium hydroxide, are useful against the group of unconventional transmissible agents which includes scrapie. The implications of this problem for the rendering industry and farm practice are discussed.
Vet Rec 1989 Mar 25
PMID:Scrapie agent decontamination: implications for bovine spongiform encephalopathy. 249 90

Bovine spongiform encephalopathy (BSE) occurred in cattle in Great Britain after the inclusion of protein derived from infected tissues in their feed, and the incidence of the disease has been reduced by the introduction of legislation to prevent the inclusion of such protein in ruminant feed. This paper describes a case-control study designed to investigate whether there is any evidence for direct transmission of infection to cattle born after the introduction of this legislation. The offspring of animals that were subsequently affected with BSE were not found significantly more often among the cases. There was a statistically significant risk for animals born up to three days after a subsequently affected animal calved, but it may not indicate a causal association. Even after adjusting for an animal's exposure to infected animals that calved but would have been culled from the herd before developing clinical signs of BSE these routes of transmission could not account for the majority of cases born after the introduction of the legislation. A between herd comparison is suggested as a method of investigating alternative sources of infection.
Vet Rec 1995 Apr 01
PMID:An investigation of risk factors for cases of bovine spongiform encephalopathy born after the introduction of the 'feed ban'. 760 6

Bovine spongiform encephalopathy (BSE) is one of a family of scrapie-like diseases which affect various mammals. Polymorphisms and mutations of the PrP gene have been associated with the incidence of experimental and natural scrapie in other animals and this study of the bovine PrP gene was undertaken to discover whether there was a similar association with PrP genotype in cattle with BSE. There are two known polymorphisms of the coding region of the bovine PrP gene, a silent HindII restriction site polymorphism and a difference in the number of an octapeptide repeated sequence (either five or six copies). An analysis of 370 cattle in Scotland revealed no difference between the frequencies of these PrP genotypes in healthy cattle and cattle with BSE.
Vet Rec 1994 Oct 22
PMID:Frequencies of PrP gene variants in healthy cattle and cattle with BSE in Scotland. 785 30

This study assesses quantitatively the risk that other countries, in particular those within the European Union, have incurred by importing cattle from the United Kingdom during the period before or shortly after the ban on the import of live breeding stock was introduced in 1989. It does this by assessing the probability that animals imported from the UK in a certain year would have become a detected BSE case, had they not been exported. Using the annual incidence rates available for separate birth cohorts and a given culling rate, a cumulative incidence for each birth cohort was calculated. These figures were then combined with the numbers of live breeding cattle imported from the UK into the other countries of the EU, to give an import-related risk index for each country, assuming that their culling rates were similar to that in Great Britain. The countries could thus be categorised in terms of the number of cases of BSE they might have expected.
Vet Rec 1997 Aug 23
PMID:Risk of BSE from the import of cattle from the United Kingdom into countries of the European Union. 933 Apr 79

Heart rates of healthy cows and cows suspected of having bovine spongiform encephalopathy were measured by auscultation and by a portable cardiac monitor. Bradycardia was demonstrated in suspect cases which were confirmed histopathologically. Disturbances in cardiac rhythm were also evident in some cases. Healthy cows deprived of food exhibited bradycardia. The administration of pharmacological doses of atropine indicated that bradycardia in BSE was mediated by increased vagal influence, suggesting that the cardioinhibitory reflexes in the caudal brainstem were functionally altered by the disease.
Vet Rec 1997 Oct 04
PMID:Abnormalities of heart rate and rhythm in bovine spongiform encephalopathy. 935 Nov 81

BSE, food safety and the veterinarian's role in certification were among matters discussed by the BVA's President, Mr Ted Chandler, at a speech in Ballymena on October 29. Speaking at the BVA's Northern Ireland dinner, at which representatives of Government, local veterinary associations, the farming community and other organisations were present, Mr Chandler emphasised the need for the Government to recognise the veterinary profession's vital contribution to food hygiene and its pivotal role in ensuring that standards are maintained. The main text of his speech is given here.
Vet Rec 1997 Nov 08
PMID:Beef exports: looking for an opening. 940 24

The likely impacts of BSE policy on UK milk and beef markets and on livestock numbers between 1997 and 2000 are explored using a dynamic spreadsheet model of UK milk and beef production, and linked demand, price and supply models for alternative meats. Two accelerated slaughter policies are considered--one representing the 'Florence Agreement' and the other involving an additional culling of calves born to confirmed BSE cases. The projections show significant changes to livestock populations over the next few years with implications for veterinary inputs. It is estimated that the BSE crisis will result in a fall in expenditure on veterinary medicines and services of around 10 Pounds million in 1999 (for the Florence Agreement) compared with that projected in the absence of the BSE crisis.
Vet Rec 1998 Feb 14
PMID:Implications of BSE policy for livestock production and veterinary services in the United Kingdom. 951 27

To help assess the immunological functions of the liver peritoneum, expression and 3D-microlocalization of adhesion molecules were studied by immuno-SEM and -TEM. The peritoneal tissues of the liver obtained from lipopolysaccharide (LPS, 1.5 microg/g BW for 24 hr)-stimulated (n = 18 including nine controls) and non-stimulated mice (n = 6 including three controls) were analyzed by immunolabeling with 15 nm gold particle single-labeling analysis of ICAM-1, ICAM-2, VCAM-1, MAdCAM-1, PECAM-1, ELAM-1, and CD105 expression. In addition, 10 and 20 nm gold particle double-labeling analysis of ICAM-1 and VCAM-1 was carried out with conventional TEM and BSE (backscatter electron) imaging. Gold particles detected in the peritoneal mesothelial cells were quantified using a computer analyzer, LUZEX III. Only ICAM-1 in non-stimulated mice and both ICAM-1 and VCAM-1 in LPS-stimulated mice were expressed on the mesothelium, but no other adhesion molecules were detected in either condition. Expression of ICAM-1 was consistently about four times greater than that of VCAM-1. Each adhesion molecule was restricted to the microvilli. ICAM-1 was expressed on all microvilli and tended to form clusters of three or four molecules. On the other hand, about 24% of the microvilli expressed VCAM-1 and less clustering was seen. Double-labeling techniques disclosed that VCAM-1 and ICAM-1 were rarely closely associated, usually spaced by about 40 nm. These results suggest that microvilli of the mesothelial cell play a significant role in leukocyte migration in the peritoneal cavity, by providing the important substrates for adhesion, ICAM-1 and VCAM-1.
Anat Rec 2000 01 01
PMID:Expression of adhesion molecules relevant to leukocyte migration on the microvilli of liver peritoneal mesothelial cells. 1060 47


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