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Tick-borne fever (TBF) is caused by the bacterium Anaplasma phagocytophilum that is transmitted by the tick Ixodes ricinus, which is a major challenge in sheep farming along the coast of south-western Norway. Few efficient and sustainable preventive measures are available, but older lambs seem to be more susceptible than younger lambs to an A. phagocytophilum infection. A field experiment was carried...
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