Multi-dimensional diagnosis of intramammary infections: a threeherd evaluation

A.L. Rivas; K.L. Anderson; G. Leitner; M. Chaffer; O. Krifuks; R.R. Rodríguez

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Multi-dimensional diagnosis of intramammary infections: a threeherd evaluation

In: Mastitis control

Authors:

A.L. Rivas

A.L. Rivas ¹NCSU, Raleigh, NC 27606, USA

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K.L. Anderson

K.L. Anderson ¹NCSU, Raleigh, NC 27606, USA

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G. Leitner

G. Leitner ²Kimron Vet. Institute, Bet Dagan, 50250, Israel Corresponding author: arl4@cornell.edu

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M. Chaffer

M. Chaffer ²Kimron Vet. Institute, Bet Dagan, 50250, Israel Corresponding author: arl4@cornell.edu

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O. Krifuks

O. Krifuks ²Kimron Vet. Institute, Bet Dagan, 50250, Israel Corresponding author: arl4@cornell.edu

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R.R. Rodríguez

R.R. Rodríguez ¹NCSU, Raleigh, NC 27606, USA

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Type:: Chapter

Pages:: 243–249

DOI:: https://doi.org/10.3920/9789086866496_046

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Four questions that influence mastitis diagnostics were assessed: (1) are all infections equal?; (2) is inflammation=infection?; (3) is measurement of somatic cell count (SCC) = measurement of inflammation?; and (4) can a single test/cut-off point be applied to all herds? These questions were addressed in 3 studies (n=1104 samples) that explored: (1) host- (leukocyte, animal), (2) herd-, and (3) microbe-related (minor vs. major pathogen) dimensions. Multidimensional (microbial-host-population) assessments (MA) identified 6 health/disease data subsets. Three methods were then evaluated using both SCC and MA tests by: (1) dividing the population data into subsets (‘PART’); (2) not dividing the data (‘Non-P’); and (3) focusing only on diseasenegative samples (‘rapid’ PART test). In Non-P and PART microbiological results provided reference data while Receiver Operating Characteristics determined each test’s optimal cut-off point. The rapid method only considered leukocyte data. Not all infections were equal: one disease+ subset showed leukocyte profiles consistent with recovery; another subset revealed major pathogens but no inflammation (‘I w/o I’). No test was applicable across populations. All tests showed different optimal cut-off points. PART correctly diagnosed 91.7%, 92.6%, and 98.6% of all samples in all 3 studies, while Non-P diagnosed 75.8%, 84.0% and 98.1% respectively. The rapid method correctly identified between 0.8% and 11.7% more diseasenegative samples than the Non-P. The higher accuracy of MA tests seemed to be explained by: a) correct diagnosis of ‘I w/o I’ samples, and b) independence from pre-selected cut-off points. MA testing may provide greater diagnostic and prognostic accuracy, saving time and other resources.

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Mastitis control

From science to practice

E-Book ISBN:: 9789086866496

Publisher:: Wageningen Academic

Print Publication Date:: 30 Oct 2008

Subjects
- Life Sciences

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Multi-dimensional diagnosis of intramammary infections: a threeherd evaluation

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Mastitis control

From science to practice

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