Experimental Bovine Spongiform Encephalopathy Research Articles

Experimentally induced bovine spongiform encephalopathy did not transmit via goat embryos.

Goats are susceptible to experimental challenge with bovine spongiform encephalopathy (BSE). This study set out to investigate whether the transmission of BSE could occur in goats following the transfer of embryos from experimentally infected donor females into uninfected recipient females. The results showed no evidence of transmissible spongiform encephalopathy disease in any of the offspring which developed from embryos from infected donors, nor indeed in any of the recipient females used as surrogate dams. In addition, there was no indication of experimental BSE spreading as either a venereal infection to males used in mating or by maternal transmission to offspring born naturally to experimentally infected donors, although numbers were small.

Molecular analysis of ovine prion protein identifies similarities between BSE and an experimental isolate of natural scrapie, CH1641.

New variant Creutzfeldt-Jakob disease (vCJD) and bovine spongiform encephalopathy (BSE) are caused by the same strain of pathogen and, as sheep can develop experimental BSE, this has raised concern that humans may be at risk from eating mutton if BSE has naturally transmitted to sheep. Biochemical typing of abnormal prion proteins (PrPsc) has been suggested to detect BSE in sheep. Although this approach is ingenuous, we can now report biochemical evidence of strain variation in contemporary and archival brain tissue from cases of experimental BSE or experimental and natural scrapie in sheep. Interestingly, we found at least one isolate of natural scrapie (CH 1641) with a very similar, but not identical, PrPsc profile to BSE but which differs from BSE in its transmission characteristics to mice.

Preliminary observations on the pathogenesis of experimental bovine spongiform encephalopathy (BSE): an update

Further preliminary observations are reported of an experiment to examine the spread of infectivity and the occurrence of pathological changes in cattle exposed orally to infection with bovine spongiform encephalopathy....

Experimental transmission of BSE and scrapie to the common marmoset

Two young male common marmosets (Callithrix jacchus) were injected intracerebrally and intraperitoneally with a crude brain homogenate prepared from a cow with bovine spongiform encephalopathy (BSE). Two other marmosets were similarly injected with brain homogenate from a sheep with natural scrapie. The two animals injected with scrapie material developed neurological signs 38 and 42 months after injection and the two animals injected with BSE material developed neurological signs after 46 and 47 months. Post mortem examination of the brains revealed spongiform encephalopathy especially in the basal nuclei and diencephalon of all the animals and, in addition, involvement of the cerebral cortex of the marmosets injected with scrapie material. The experiment extends the host range of experimental BSE to include a primate species.