Sampling sheep for scrapie test. Farmer workers keeping a sheep calm while a veterinarian (right) draws blood to test the animal for genetic resistance to scrapie. Scrapie, caused by a prion, is a fatal, degenerative disease that affects the nervous systems of sheep and goats. This research is being carried out by the Agricultural Research Service of the US Department of Agriculture. Photographed in the USA.
July 24th, 2016
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