The use of green fluorescent protein as a marker for Brucella vaccines.
Brucellosis is an important malady of productive and wildlife animals and a worldwide zoonosis. The use of effective vaccines and the corresponding diagnostic tests that allow differentiating infected from vaccinated animals are essential tools to control the disease. For this, a prototype of Brucella abortus S19 vaccine expressing green fluorescent protein (S19-GFP) was constructed. The S19-GFP was readily identified under ultraviolet light by macroscopic and microscopic examination and maintained all the biochemical characteristics of the parental S19 vaccine. S19-GFP replicated ex vivo and in vivo, and protected mice against challenge with virulent B. abortus to the same extent as the isogenic S19. An immunoenzymatic assay designed to measure anti-GFP antibodies allowed the discrimination between mice vaccinated with S19-GFP and those immunized with S19. Both vaccines raised antibodies against lipopolysaccharide molecule to similar levels. This experimental model constitutes a "proof of concept" for the use of Brucella-GFP vaccines and associated diagnostic tests to distinguish vaccinated from naturally Brucella infected animals.
Programa de Investigación en Enfermedades Tropicales, Escuela de Medicina Veterinaria, Universidad Nacional, 3000 Heredia, Costa Rica.
Carlos
C
Chacón-Díaz
Melissa
M
Muñoz-Rodríguez
Elías
E
Barquero-Calvo
Caterina
C
Guzmán-Verri
Esteban
E
Chaves-Olarte
María Jesús
MJ
Grilló
Edgardo
E
Moreno
D000818:Animals; D002004:Brucella Vaccine / Q000008:administration & dosage* / Q000276:immunology*; D002003:Brucella abortus / Q000276:immunology*; D002006:Brucellosis / Q000175:diagnosis / Q000517:prevention & control / Q000662:veterinary*; D003937:Diagnosis, Differential; D004195:Disease Models, Animal; D005260:Female; D049452:Green Fluorescent Proteins / Q000008:administration & dosage* / Q000276:immunology*; D051379:Mice; D022581:Vaccines, Marker / Q000008:administration & dosage / Q000276:immunology; D015047:Zoonoses
D002004:Brucella Vaccine; D022581:Vaccines, Marker; D049452:Green Fluorescent Proteins