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Epidemiologie investigation of a silage-associated epizootic of ovine listeric encephalitis, using a new Listeria-selective enumeration medium and phage typing

1992; American Veterinary Medical Association; Volume: 53; Issue: 3 Linguagem: Inglês

10.2460/ajvr.1992.53.3.368

1943-5681

José A. Vázquez‐Boland, Lucas Domı́nguez, M. Mar Blanco, J. Rocourt, José Francisco Fernández‐Garayzábal, C. B. Gutiérrez, R. I. Tascón, Elías Fernando Rodríguez Ferri,

Salmonella and Campylobacter epidemiology

Summary The role of silage feeding in the origin of an epizootic of encephalitic listeriosis in a sheep flock was investigated by use of a new direct Listeria -selective isolation and enumeration medium, in combination with serotyping and phage typing. The silage contained high numbers (about 10 6 cells/g) of a L monocytogenes strain indistinguishable with respect to serovar and phagovar from that isolated from the brains of sick sheep. These results provided unambiguous bacteriologic evidence of the epidemiologic link between silage consumption and listeriosis in ruminants.