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Like other comparative sciences, and despite its recent beginning comparative virology has already contributed useful applications and observations to human health research. Teachings derived from the study of Marek's disease found application in that of Burkitt's lymphoma, and may lead to a possible vaccine against the human disease. Equally useful information came from the study of canine distemper in the development of a chorio-allantoic membrane attenuated measles vaccine, and in our knowledge of subacute sclerosing panencephalitis (SSPE) of humans; from the study of reovirus-like agents of infant mice and neonatal calves in that of an acute nonbacterial gastro-enteritis of infants and young children; and from that of the cancer-producing viruses of chickens, cats, and dogs to a better understanding of some human neoplasias. Finally, Aleutian mink disease may be an excellent natural model for the study of the collagen diseases of man, and scrapie of sheep one for that of a human chronic degenerative disease of the central nervous system of humans such as Kuru. Comparative virology has proved quite productive in a relatively short period, and is unlikely to be neglected in the future.
Vet Rec 1975 Jun 28
PMID:Newer knowledge in comparative virology--its contribution to human health research. 16 4

The brains from 18 cats were examined for the presence of the fibrils and modified PrP protein which are molecular diagnostic markers for scrapie-like diseases. Thirteen cats were referred with clinical neurological signs potentially indicative of feline spongiform encephalopathy (FSE). Of these, five had histopathological changes of FSE, five had other lesions of the central nervous system, and in three the brain was normal. The remaining five cats had no clinical neurological signs and were selected as controls. Fibrils and modified PrP protein were found in the brains of the five cats with FSE and in one of the cats with neurological signs but no histopathological changes in the central nervous system. Fibrils were present in the absence of modified PrP in the brains of two cats, one with neurological signs and a histologically confirmed meningioma, and one with no neurological signs and a histologically normal brain.
Vet Rec 1992 Oct 03
PMID:Feline spongiform encephalopathy: fibril and PrP studies. 127 83

The technique of embryo transfer was used to investigate the maternal transmission of scrapie in sheep. Embryo donor ewes were experimentally infected with scrapie (all eventually developing the disease) and artificially inseminated six months later with semen from an uninfected scrapie-susceptible ram. Embryos were harvested five and six days after insemination and transferred by laparoscopy, unwashed, into recipient ewes which had been genetically selected for very low susceptibility to scrapie. Six of the 26 lambs born to these recipients developed scrapie.
Vet Rec 1992 Apr 18
PMID:Studies on maternal transmission of scrapie in sheep by embryo transfer. 135 Jun 94

One hundred and sixty-seven sheep of 32 breeds and crossbreeds affected by natural scrapie throughout Britain were tested for the presence of restriction fragment length polymorphisms of the PrP gene observed when their DNA was digested with EcoRI or HindIII. These polymorphisms have already been associated with different susceptibilities to experimental scrapie (controlled by alleles of the Sip gene) in a flock of Cheviot sheep. In two studies 86 to 92 per cent of the sheep were found to carry the PrP gene EcoRI fragment e1 which is associated with high susceptibility (or the sA allele of Sip) to experimental scrapie. The PrP gene HindIII genotypes of the natural scrapie sheep were not apparently associated with differences in susceptibility to scrapie. There was no link between the polymorphisms and the age or breed of the affected sheep.
Vet Rec 1992 May 02
PMID:Natural scrapie in British sheep: breeds, ages and PrP gene polymorphisms. 135 94

A captive adult puma developed ataxia, a hypermetric gait and whole body tremor. The signs progressed over a period of six weeks. Histopathological examination following euthanasia demonstrated spongiform encephalopathy, gliosis and mild non-suppurative meningoencephalitis. Immunostaining with a polyclonal antiserum revealed prion protein (PrP) associated with these changes in sections of cervical spinal cord and medulla. This is the first confirmed case of a scrapie-like spongiform encephalopathy described in a non-domestic cat in the United Kingdom.
Vet Rec 1992 Nov 07
PMID:Spongiform encephalopathy in a captive puma (Felis concolor). 145 92

The brains of the 20 goats affected with natural scrapie received at the Central Veterinary-Laboratory, Weybridge, since 1975 were examined microscopically. Lesions of a spongiform encephalopathy were found in the brainstem, cerebellum, diencephalon, corpus striatum, and also in the neopallium or cerebral cortex. The lesions in the neopallium have not previously been reported in natural scrapie in goats. Deposits of amyloid were present in the thalamus in three of the 20 goats.
Vet Rec 1992 Aug 01
PMID:Natural scrapie in goats: neuropathology. 152

The case histories of the 20 goats affected with natural scrapie which have been examined since 1975 at the Central Veterinary Laboratory, Weybridge, are reviewed. Their ages ranged from two to seven years (median three years, four months) and 85 per cent of them were between two and four years old. The most common clinical signs were hyperaesthesia, ataxia and pruritus. The histories indicated that scrapie can occur in goats which have not been in contact with sheep.
Vet Rec 1992 Jul 25
PMID:Natural scrapie in goats: case histories and clinical signs. 152 2

Six cases of scrapie were confirmed in two separately maintained flocks of moufflon, in both of which the disease appeared to be endemic. The clinical signs and histopathology were indistinguishable from those observed in scrapie-affected domesticated sheep. The pathology included lesions in the cerebral cortex which, although commonly present in scrapie-affected sheep, have not previously been described in the natural disease.
Vet Rec 1992 Jan 11
PMID:The natural occurrence of scrapie in moufflon. 154 78

Following the identification of bovine spongiform encephalopathy (BSE) in the British cattle population in 1986 epidemiological studies were launched. This paper provides an updated account of the epidemiological features of BSE from 1985, when the first cases, based on clinical histories, occurred, until 1990. The number of cases up to December 1989 represents an annual incidence of 3.9 confirmed cases per 1000 adult animals in Great Britain. Many more dairy herds were affected than beef suckler herds, a difference attributable to the difference in feeding practices between the two herd types. The geographical variation in incidence previously described has persisted with the highest incidence in the south and east of England. Other features of the epidemiology, including the low within-herd incidence, remained unaltered from the earlier findings. The results support the previously suggested hypothesis that the outbreak of BSE was due to the sudden exposure of the cattle population to a scrapie-like agent in 1981/82. There was no evidence of direct transmission between cattle during the period considered.
Vet Rec 1992 Feb 01
PMID:Bovine spongiform encephalopathy: epidemiological features 1985 to 1990. 155 77

This study describes the epidemiological features of bovine spongiform encephalopathy (BSE) in Northern Ireland where the first case occurred in November 1988. They were very similar to those observed in Great Britain except that the annual incidence of BSE in 1990 in Northern Ireland, 2.3 confirmed cases per 10,000 adult cows, was approximately one 10th of that in Great Britain. The findings were also consistent with the current hypothesis that affected cattle had been exposed to a scrapie-like agent via cattle feedstuffs containing ruminant-derived protein. However, a preliminary investigation of the potential sources of infection for cattle in Northern Ireland did not provide any conclusive evidence.
Vet Rec 1992 Feb 08
PMID:Bovine spongiform encephalopathy in Northern Ireland: epidemiological observations 1988-1990. 156 42


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