A Brucella melitensis H38ΔwbkF rough mutant protects against Brucella ovis in rams
Loading...
Date
2022
Authors
Muñoz Álvaro, Pilar MaríaConde Álvarez, Raquel
Andrés Barranco, Sara
Miguel López, María Jesús de
Zúñiga Ripa, Amaia
Aragón Aranda, Beatriz
Salvador Bescós, Miriam
Martínez Gómez, Estrella
Iriarte, Maite
Barberán Pelegrín, Montserrat
Vizcaíno, Nieves
Moriyón Uria, Ignacio
Blasco Martínez, José María
Journal Title
Journal ISSN
Volume Title
Publisher
Typology
Journal ContributionArticle
Abstract
Brucella melitensis and Brucella ovis are gram-negative pathogens of sheep that cause severe economic losses and, although B. ovis is non-zoonotic, B. melitensis is the main cause of human brucellosis. B. melitensis carries a smooth (S) lipopolysaccharide (LPS) with an N-formyl-perosamine O-polysaccharide (O-PS) that is absent in the rough LPS of B. ovis. Their control and eradication require vaccination, but B. melitensis Rev 1, the only vaccine available, triggers anti-O-PS antibodies that interfere in the S-brucellae serodiagnosis. Since eradication and serological surveillance of the zoonotic species are priorities, Rev 1 is banned once B. melitensis is eradicated or where it never existed, hampering B. ovis control and eradication. To develop a B. ovis specific vaccine, we investigated three Brucella live vaccine candidates lacking N-formyl-perosamine O-PS: Bov::CAΔwadB (CO2-independent B. ovis with truncated LPS core oligosaccharide); Rev1::wbdRΔwbkC (carrying N-acetylated O-PS); and H38ΔwbkF (B. melitensis rough mutant with intact LPS core). After confirming their attenuation and protection against B. ovis in mice, were tested in rams for efficacy. H38ΔwbkF yielded similar protection to Rev 1 against B. ovis but Bov::CAΔwadB and Rev1::wbdRΔwbkC conferred no or poor protection, respectively. All H38ΔwbkF vaccinated rams developed a protracted antibody response in ELISA and immunoprecipitation B. ovis diagnostic tests. In contrast, all remained negative in Rose Bengal and complement fixation tests used routinely for B. melitensis diagnosis, though some became positive in S-LPS ELISA owing to LPS core epitope reactivity. Thus, H38ΔwbkF is an interesting candidate for the immunoprophylaxis of B. ovis in B. melitensis-free areas.
Description
Keywords
Bibliographic citation
Veterinary Research, vol. 53, (2022)
AGROVOC subjects
BrucelosisBrucella ovis
Vacuna
Ovinos