Ribal Sanchis

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Salmonella enteritidis subsp. enteritidis ser. abortus ovis, a sheep-adapted serotype, causes a contagious infectious disease with abortion as the main symptom, sometimes accompanied with mortality of lambs. This auxotrophic gram-negative bacterium ranks among the main causes of ovine abortions in some countries of Europe and of western Asia. The disease(More)
Contagious agalactia affects goats and sheep. In most infected sheep, the causal agent, Mycoplasma agalactiae, induces mastitis and/or agalactia, keratoconjunctivitis and arthritis. However, a few strains of M. agalactiae were isolated from tank milk from flocks without any clinical signs. The present study was undertaken to compare these apparently(More)
One hundred thirty-three strains of Pasteurella haemolytica of both biotypes (90 and 43 strains of biotypes A and T, respectively) and almost all the serotypes were subjected to ribotyping, random amplified polymorphic DNA (RAPD) analysis, and pulsed-field gel electrophoresis (PFGE) analysis for epidemiological purposes. A total of 15 patterns recorded as(More)
Four groups of 50 4-6-month old ewe-lambs were vaccinated with 1 or 2 living attenuated vaccines administered simultaneously. One hundred ewe-lambs received B melitensis strain REV 1 vaccine subcutaneously and 100 others received Rev 1 vaccine conjunctivally. In each group, 50 ewe-lambs simultaneously received the S abortusovis strain Rv6 vaccine via a(More)
Living attenuated vaccines may help control infection with Salmonella enterica subspecies enterica ser abortusovis in sheep without constraints incompatible with husbandry. Virulence and immunogenicity of 2 Abortusovis streptomycin-dependent strains and 3 reverse mutants were compared in sheep, the virulent parental strain Abortusovis 15/5 being used as(More)
The aim of this work was to explore the first stages of infection with Salmonella Abortusovis after a mucosal inoculation, and to establish an experimental model limiting the bacteriological investigations to the inoculation site. Four groups of 6 ewe-lambs were infected by the conjunctival route with decreasing doses of Salmonella Abortusovis. The clinical(More)
Salmonella enterica subsp. enterica ser. Abortusovis, a sheep-adapted serotype, causes a contagious disease. Abortion is the major symptom and the main source of contamination. Research on this ovine disease may aid farmers, but may also contribute to comparative biological knowledge. Innate resistance partly controlled by the Ity locus, increased(More)
Salmonella abortusovis strain Rv6 (Sao Rv6) is a live attenuated vaccine used for a few years to protect ewes against abortive salmonellosis. As Salmonellae, particularly Salmonella aro mutants, have considerable potential as vehicles for the presentation of heterologous vaccine antigens, Sao Rv6 was tested in order to develop a vaccinal vehicle for small(More)
Annual serological testing of flocks vaccinated by the subcutaneous route with a live, attenuated strain of Salmonella Abortusovis has previously demonstrated the persistence of agglutinating antibodies. It has however been impossible to determine whether the antibodies originated from the vaccination or from an enzootic infection. The serological response,(More)
Merinos ewe-lambs from Arles formed part of a transhumant flock in which S. abortus ovis infection was enzootic. A lyophilized living vaccine was prepared from an attenuated mutant strain of Salmonella abortus ovis. About one third out of 450 ewe-lambs of the same flock received one subcutaneous injection of vaccine 1 to 3 months before fecundation; the(More)