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1 Institute for Animal Health, AFRC and MRC Neuropathogenesis Unit, Ogston Building, West Mains Road, Edinburgh EH9 3JF
and2 Department of Biological Sciences, Napier University, 219 Colinton Road, Edinburgh EH14 1DJ, U.K.
Mice congenic for the Sinc gene were infected intracerebrally with two scrapie strains, ME7 and 22A. At various times during the incubation period tissues were monitored for the infection-specific form of PrP (PrPSc). PrPSc was found in brain, spleen, lymph nodes, pancreas, submaxillary gland and thymus. After intraperitoneal inoculation PrPSc was found in spleen, lymph nodes, pancreas and submaxillary glands prior to its detection in brain. The kinetics of accumulation of PrPSc in these tissues was dependent on the infecting strain of agent, on the mouse Sinc genotype and on the route of infection. This study supports using the presence of PrPSc as an indicator of infectivity in brain and extraneural tissues and defines some of the parameters which influence when and where PrPSc is first found.
Received 12 July 1993;
accepted 22 October 1993.
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