Abstract
An antiserum against a fraction enriched for scrapie-associated fibrils (SAF), was examined for its effects on scrapie incubation period by inoculating mice either intraperitoneally or intracerebrally with various dilutions of the serum mixed with scrapie-infected mouse brain homogenate. After intraperitoneal inoculation the mean time of the incubation period increased with increasing concentrations of the antiserum in a statistically significant fashion, when the serum dilutions were made with phosphate-buffered saline. After intracerebral inoculation, however, there were no statistically significant differences between the control group and any of the antiserum-groups. When the antiserum dilutions were made with pre-immune serum, the mice inoculated intraperitoneally also showed no significant differences between the two groups. These results indicate that the specific antibodies to SAF have no effect on the scrapie infectivity.
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