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Souza IIFD, Rodrigues RDA, Gonçalves Jorge KS, Silva MR, Lilenbaum W, Vidal CES, Etges RN, Kostovic M, Araújo FR. ELISA using a recombinant chimera of ESAT-6/MPB70/MPB83 for Mycobacterium bovis diagnosis in naturally infected cattle. J Vet Med Sci 2018; 81:9-14. [PMID: 30305467 PMCID: PMC6361649 DOI: 10.1292/jvms.18-0364] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Bovine tuberculosis (bTB) control programs generally rely on intradermal tuberculin tests for the antemortem diagnosis of Mycobacterium bovis infection in cattle, but these
tests detect only a portion of the infected animals. The aim of the present study was to evaluate the diagnostic coverage of a combination of the bTB antemortem techniques known as the
comparative intradermal tuberculin test (CITT) and an ELISA based on a recombinant chimera of ESAT-6/MPB70/MPB83 as the antigen in cattle. The results were compared to postmortem findings
based on M. bovis culturing and PCR. Paired comparisons of all data (n=92) demonstrated that ELISA and LST results compared to the culturing results did not present
significant differences (P=0.27 on McNemar’s test and P=0.12 on Fisher’s exact test, respectively). Using culturing as the gold standard, the sensitivity
and specificity of ELISA were 79.5% (95% CI: 64.5–89.2%) and 75.5% (95% CI: 62.4–85.1%), respectively, whereas LST demonstrated 100% sensitivity (95% CI: 91.03–100%) and 92.5% specificity
(95% CI: 82.1–97.0%). The ELISA results did not reveal significant differences in relation to the LST results (P>0.99 on Fisher’s exact test). Using the latter as the
gold standard, the sensitivity and specificity of ELISA were 79.1% (95% CI: 64.8–88.6%) and 79.6% (95% CI: 66.4–88.5%), respectively. The use of ELISA with the recombinant chimera of
ESAT-6/MPB70/MPB83 as the antigen complements the diagnostic coverage provided by CITT and increases the removal of infected animals from herds.
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Affiliation(s)
- Ingrid Ieda Fernando de Souza
- Postgraduate Program in Biotechnology and Biodiversity of the Central Western Region, Federal University of Mato Grosso do Sul, Campo Grande, MS 79070-900, Brazil
| | - Rudielle de Arruda Rodrigues
- Postgraduate Program in Veterinary Sciences, School of Veterinary Medicine (FAMEZ), Federal University of Mato Grosso do Sul, Campo Grande, MS 79070-900, Brazil
| | - Kláudia Santos Gonçalves Jorge
- Postgraduate Program in Veterinary Sciences, School of Veterinary Medicine (FAMEZ), Federal University of Mato Grosso do Sul, Campo Grande, MS 79070-900, Brazil
| | | | - Walter Lilenbaum
- Laboratory of Veterinary Bacteriology, Fluminense Federal University, Niterói, RJ 24. 210-130, Brazil
| | - Carlos Eugênio Soto Vidal
- Regional Technical Unit for Agriculture, Livestock and Supply of Santa Maria (UTRA), Ministry of Agriculture, Livestock and Supply, Santa Maria, RS 97050-500, Brazil
| | - Rodrigo Nestor Etges
- Secretary of Agriculture, Livestock and Irrigation (SEAPI), State Government of Rio Grande do Sul, Porto Alegre, RS 90150-900, Brazil
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