about 100,000 follicles, and all of these could be infected and shedding prions into the lumen.Scrapie prions have been found in the Peyer's patches of naturally infected asymptomatic lambs as young as four months of age.

Exposure through contaminated vaccines

* Contaminated Louping-ill vaccine, known as the 1935 Moredun Louping-ill Vaccine Disaster. More than 1,500 sheep developed scrapie following vaccination.

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