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HI antibodies in titres of 1:16 or above were present in serum from 200 (61.5%) of 325 cattle. 56% of the 127 cattle less than 4 years old, and 75% of the 73 cattle over 4 years old were positive. A previous investigation in Valdivia province, reported in 1980, found 73% of cattle positive. The...

Berríos, P.; Celedón, M. O.; Pinto D'Aguiar, A.; Gonzáilez, G.
Archivos de Medicina Veterinaria, Chile, 1983, 15, 2, pp 73-79