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Nathues, Heiko; Meemken, D.; Harder, T.C.; Doherr, M.G.; Grotha, I.; Greiser-Wilke, I. (2009). Frequency of PRRS live vaccine virus (European and North American genotype) in vaccinated and non-vaccinated pigs submitted for respiratory tract diagnostics in North-Western Germany. Preventive veterinary medicine, 92(1-2), pp. 31-7. Amsterdam: Elsevier 10.1016/j.prevetmed.2009.07.010
