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Detection of Mycobacterium avium Subspecies paratuberculosis: Comparing Fecal Culture Versus Serum Enzyme-Linked Immunosorbent Assay and Direct Fecal Polymerase Chain Reaction

Clark, D.L. ; Koziczkowski, J.J. ; Radcliff, R.P. ; Carlson, R.A. ; Ellingson, J.L.E.

Journal of dairy science, 2008-07, Vol.91 (7), p.2620-2627 [Periódico revisado por pares]

Savoy, IL: Elsevier Inc

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Título:
Detection of Mycobacterium avium Subspecies paratuberculosis: Comparing Fecal Culture Versus Serum Enzyme-Linked Immunosorbent Assay and Direct Fecal Polymerase Chain Reaction
Autor: Clark, D.L. ; Koziczkowski, J.J. ; Radcliff, R.P. ; Carlson, R.A. ; Ellingson, J.L.E.
Assuntos: animal pathogenic bacteria ; Animal productions ; Animals ; Biological and medical sciences ; Cattle ; cattle diseases ; Cattle Diseases - diagnosis ; Colony Count, Microbial - methods ; Colony Count, Microbial - veterinary ; dairy cattle ; detection ; disease detection ; disease surveillance ; enzyme-linked immunosorbent assay ; Enzyme-Linked Immunosorbent Assay - methods ; Enzyme-Linked Immunosorbent Assay - standards ; Enzyme-Linked Immunosorbent Assay - veterinary ; feces ; Feces - microbiology ; Female ; Food industries ; Fundamental and applied biological sciences. Psychology ; General aspects ; Methods of analysis, processing and quality control, regulation, standards ; microbial growth ; Mycobacterium avium subsp. paratuberculosis ; Mycobacterium avium subsp. paratuberculosis - immunology ; Mycobacterium avium subsp. paratuberculosis - isolation & purification ; Mycobacterium paratuberculosis ; paratuberculosis ; Paratuberculosis - diagnosis ; polymerase chain reaction ; Polymerase Chain Reaction - methods ; Polymerase Chain Reaction - standards ; Polymerase Chain Reaction - veterinary ; Reproducibility of Results ; Sensitivity and Specificity ; serodiagnosis ; signs and symptoms (animals and humans) ; Terrestrial animal productions ; test sensitivity ; test specificity ; Time Factors ; Vertebrates
É parte de: Journal of dairy science, 2008-07, Vol.91 (7), p.2620-2627
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Mycobacterium avium ssp. paratuberculosis (MAP) is the etiologic agent of Johne's disease in cattle. The disease causes diarrhea, reduced milk production, poor reproductivity, emaciation, and eventually death. Culture on Herrold's egg yolk agar is considered to be the definitive test for diagnosis of Johne's in cattle. This method has moderate sensitivity (30 to 50%) and is 100% specific; however, it can take up to 16 wk due to the slow growth of MAP. Currently, serum ELISA is used to screen herds for Johne's disease, but positive tests must be confirmed culturally or by PCR. The current research sought to evaluate an in-house direct fecal PCR procedure and directly compare it to ELISA using culture as the gold standard. Serum and fecal samples were collected from cows (n=250) with unknown Johne's status. Fecal samples were processed for culture on Herrold's egg yolk agar and direct PCR. Serum samples were tested using the Parachek serum ELISA. Overall, 67/250 [26.8%, 95% confidence interval (CI) 21.4 to 32.8] animals were culturally confirmed to be shedding MAP. The PCR and ELISA detected 74/250 (29.6%, 95% CI 24 to 35.7) and 25/250 (10%, 95% CI 6.6 to 14.4), respectively. Culture and PCR were able to detect more positive animals than ELISA. Overall, direct fecal PCR was 70.2% sensitive and 85.3% specific when using culture as the gold standard. The ELISA method was 31.3% sensitive and 97.8% specific. When culture reported <10 cfu, the sensitivity and specificity of PCR and ELISA were 57.1 and 85.3%, and 4.8 and 97.8%, respectively. When culture reported 10 to <40 cfu, the sensitivity of PCR and ELISA were 75 and 50%, respectively. When culture reported ≥40 cfu, the sensitivity of PCR and ELISA were 100 and 88.2%, respectively. Specificity could not be calculated at these levels because there were no negative samples. The direct PCR outperformed the ELISA in detecting animals potentially infected with MAP and was not significantly different when compared with culture. The direct fecal PCR method described here provides faster results than traditional culture and is more sensitive than ELISA at detecting animals suspected of Johne's disease. These data support the use of PCR as an alternative method for screening herds for prevalence and diagnosis of Johne's disease.
Editor: Savoy, IL: Elsevier Inc
Idioma: Inglês

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Detection of Mycobacterium avium Subspecies paratuberculosis: Comparing Fecal Culture Versus Serum Enzyme-Linked Immunosorbent Assay and Direct Fecal Polymerase Chain Reaction

Clark, D.L. ; Koziczkowski, J.J. ; Radcliff, R.P. ; Carlson, R.A. ; Ellingson, J.L.E.

Savoy, IL: Elsevier Inc

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