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103 samples of pneumonic lung tissue of cattle from slaughterhouses in 22 municipalities and 100 samples of preputial washing from bulls in 12 municipalities were examined [date not given]. H. somnus was isolated from 4 lung and 3 preputial samples.

Acosta Hernández, R.; Franco Terrazas, C.; Rodríguez Alarcón, L.; Terán Barrera, S.; Díaz Aparicio, E.; Aguilar Romero, F.
Técnica Pecuaria en México, 1995, 33, 1, pp 29-33