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Spangler, E., Bech Nielsen, S., & Heider, L. E. (1988). A prospective evaluation of an enzyme-linked immunosorbent assay (ELISA) and agar gel immunodiffusion test (AGID) relative to fecal culture in the diagnosis of clinical and subclinical paratuberculosis in cattle in central Ohio. Acta Veterinaria Scandinavica, 243-245.

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