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

Jose A Vazquez-Boland, L Dominguez, M. Blanco, J Rocourt, Jose Francisco Fernández-Garayzábal, Cesar B Gutierrez, Ruben-Ivan Tascón , Elias Fernando Rodriguez-Ferri

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)368-71
Number of pages4
JournalAmerican Journal of Veterinary Research
Volume53
Issue number3
Publication statusPublished - Mar 1992

Keywords

  • Animals
  • Bacteriophage Typing
  • Colony Count, Microbial
  • Culture Media
  • Disease Outbreaks/veterinary
  • Food Microbiology
  • Listeria monocytogenes/classification
  • Listeria monocytogenes/growth & development
  • Listeria monocytogenes/isolation & purification
  • Listeriosis/epidemiology
  • Listeriosis/etiology
  • Listeriosis/veterinary
  • Serotyping
  • Sheep
  • Sheep Diseases/epidemiology
  • Sheep Diseases/etiology
  • Silage/adverse effects

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