Gene/Protein Disease Symptom Drug Enzyme Compound
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Sera from 295 horses in the USA were examined by an indirect immunofluorescence assay and Western blot assays to determine the prevalence of Borna disease virus infection. Eight (2.7 per cent) of the samples were positive in both assays, and 18 (6.1 per cent) were positive only in the Western blot assay. The indirect fluorescence titres ranged from 1:20 to 1:80 of antibodies recognising the virus-specific antigen from Borna disease virus-infected cells. The purified virus-specific proteins isolated from infected rat brains were recognised by positive equine serum samples after immunostaining by a Western blot technique. Information obtained from the owners about the history of the seropositive horses revealed that they were either clinically normal or had a pathological diagnosis of disease unrelated to Borna disease. This is the first report of the detection of antibodies to Borna disease virus in horses in the USA. The disease may be more widespread in a subclinical form, with very long incubation periods, and may not necessarily be restricted to historically endemic areas.
Vet Rec 1993 Mar 06
PMID:Detection of antibodies against Borna disease virus in sera and cerebrospinal fluid of horses in the USA. 846 Apr 59

A questionnaire-based, retrospective case-control study of 174 Swedish cats was used to identify possible risk factors for feline Borna disease. The questionnaire consisted of 32 questions on a wide range of subjects, including lifestyle and possible modes of virus transmission. Two control groups were used: a healthy-control and a hospital-control. Variables with significant odds ratios in either the Borna disease:healthy-control or Borna disease:hospital-control comparison were included in multiple logistic regression analyses. Overall, the models suggested that feline Borna disease has a predominantly rural/woodland distribution, that affected cats were more likely to be males than females and intact than neutered, and that they were more likely than not to have hunted mice. The results indicate that, in contrast to other feline viral infections, Borna disease virus is not readily transmitted between cats. The natural reservoir of the virus is unknown. The fact that exposure to mice by hunting was a risk factor for the disease suggests that rodents may be subclinically infected and act as virus carriers.
Vet Rec 1998 Jun 27
PMID:Case control study of feline Borna disease in Sweden. 968 29

Sporadically occurring non-suppurative encephalitis appears to be a frequent condition of Swiss cattle. Fifty-one such cases diagnosed over a period of 10 years were examined retrospectively to investigate whether they constituted one or more distinct diseases, and to search for aetiological agents. Three cases were characterised by periventricular granulomatous encephalitis, and most probably represented a different disease, but the remaining 48 cases had disseminated non-suppurative encephalitis with widespread neuronal changes. Neuronal degeneration was very marked in the hippocampus of 10 cases and in the cerebellar Purkinje cells of 11. It was thought that the latter cases represented morphological variations of the same disease rather than a different disease because of their overlapping morphological features. The 48 cases had the following features in common: the disease had primarily neurological signs affecting mostly adult cattle, it was a sporadic condition, and there was a clear tendency for it to have a subacute to chronic course. Polymerase chain reaction (PCR) amplification for chlamydial DNA was negative except in one of 32 specimens, and immunohistochemistry did not demonstrate the presence of chlamydial antigens either in the one PCR-positive case or in the other cases examined. Immunohistochemistry for rabies virus, Borna disease virus, and central European tickborne encephalitis virus was negative. In four cases, immunolabelled cells were found in the lesions with antibodies against paramyxovirus antigens.
Vet Rec 1998 Aug 29
PMID:Neuropathological and aetiological studies of sporadic non-suppurative meningoencephalomyelitis of cattle. 977 71

Borna disease virus (BDV) is a novel RNA virus that has only recently been characterised and classified in a new virus family, Bornaviridae. The virus was detected in buffy coat cells from four of five cats with neurological disease and in the brains of five of 15 cats with nervous signs and of one of three cats with non-neurological disease. In a serosurvey of 111 cats the incidence of antibody to BDV in cats with neurological disease was higher than in cats with other types of disease, suggesting that the virus may play a role in nervous diseases of cats in the UK.
Vet Rec 1998 Nov 07
PMID:Natural Borna disease virus infection in cats in the United Kingdom. 1009 37

Recombinant p40 produced by baculovirus was used in an ELISA to screen samples of serum taken from 80 cats in Istanbul. The sera were also analysed for feline immunodeficiency virus (FIV) and feline leukaemia virus (FeLV). Antibodies to Borna disease virus- (BDV) p40 were detected in 34 (42-5 per cent) of the 80 cats. Seventy-three per cent of the sera which were positive for FIV and 26 per cent of the sera which were negative for FIV had antibodies to BDV. There was no difference in the percentage of sera which were positive for BDV between the cats that were positive or negative for FeLV. Three of the cats had neurological disease and two of these had antibodies to BDV. Six sera with low, medium or high optical densities (ODS) by ELISA were analysed by Western blotting. Only the sera with medium and high ODS reacted specifically with p40 at a dilution of 1 in 1,000.
Vet Rec 2001 Nov 24
PMID:Detection of antibodies to Borna disease virus in Turkish cats by using recombinant p40. 1176 26

Numerous cases of acute-onset progressive ataxia, hindlimb paresis and paralysis of unknown aetiology occurred during 1993 to 2003 in cheetahs (Acinonyx jubatus) within the European Endangered Species Programme (eep). This study describes the immunohistochemical investigation of a possible viral aetiology of the "cheetah myelopathy". Antibodies to feline herpesvirus type 1, canine distemper virus, canine parvovirus and Borna disease virus were applied to formalin-fixed and paraffin-embedded brain and spinal cord sections from 25 affected cheetahs aged between three-and-a-half months and 13 years. Using the avidin-biotin complex technique, none of the antibodies gave positive immunosignals in either the brain or the spinal cord tissue.
Vet Rec 2006 Oct 21
PMID:Immunohistochemical screening for viral agents in cheetahs (Acinonyx jubatus) with myelopathy. 1705 52

Thirty-eight natural cases of aetiologically unclear non-suppurative encephalitis in pigs were studied retrospectively. Brain samples were examined for the presence of porcine circovirus type 2 (PCV-2), porcine respiratory and reproductive syndrome virus (PRRSV), porcine enteroviruses (PEVS), ovine herpesvirus type 2 (OvHV-2), Borna disease virus (BDV) and suid herpesvirus type 1 (SuHV-1) by molecular biological and immunohistochemical methods. Histological examination of the brains revealed variable degrees of lymphohistiocytic encephalitis or meningoencephalitis, characterised predominantly by perivascular mononuclear infiltrates. Two cases could be attributed to PCV-2 infection by in situ hybridisation: viral nucleic acid was found in the mesencephalon, the cerebellum and the medulla oblongata, mainly in the cytoplasm of macrophages, endothelial cells and some glial cells, which were predominantly found in the meninges and around blood vessels. Real-time PCR detected PCV-2 dna in brain samples from seven other pigs. There was no evidence of PRRSV, BDV, SuHV-1, PEVS or OvHV-2 in any of the brain samples examined.
Vet Rec 2007 Oct 20
PMID:Studies on the aetiology of non-suppurative encephalitis in pigs. 1795 63