National prevalence of larval echinococcosis in sheep in slaughtering plants Ovis aries as an indicator in control programmes in Uruguay von Cabrera, P.A, Irabedra, P, Orlando, D, Rista, L, Harán, G, Viñals, G, Blanco, M.T, Alvarez, M, Elola, S, Morosoli, D, Moraña, A, Bondad, M, Sambrán, Y, Heinzen, T, Chans, L, Piñeyro, L, Pérez, D, Pereyra, I

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