Evaluation of a modified Rose Bengal test and an indirect Enzyme-Linked-Immunosorbent-Assay for the diagnosis of Brucella melitensis infection in sheep
2003
Ferreira, A.C. ((Laboratorio Nacional de Investigacao Veterinaria, Lisboa (Portugal))) | Cardoso, R. | Travassos Dias, I. | Mariano, I. | Belo, A. | Rolao Preto, I. | Manteigas, A. | Pina Fonseca, A. | Correa De Sa, M.I.
A modified Rose Bengal test (mRB) and an indirect ELISA (iELISA) with Protein G as the conjugate, were evaluated for the diagnosis of Brucella melitensis infection in unvaccinated sheep with a known bacteriological status, and their diagnostic efficacy was compared with that of the standard Rose Bengal (RB) and Complement Fixation (CF) tests used in the current eradication campaign in EU countries. All tests showed 100 percent specificity when testing the sera from 212 Brucella-free sheep. When testing the sera from 219 Brucella melitensis culture-positive sheep, both the mRB and iELISA tests were more sensitive (98.6 percent and 96.8 percent, respectively) than the RB and CF tests (95.0 and 92.7 percent, respectively). These results were similar when testing the sera from 181 animals belonging to infected flocks but found bacteriologically negative, suggesting that the mRB or iELISA tests could advantageously replace the current RB procedure used as the screening test
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