Why the study?
Do AGID and commercial ELISAs accurately detect BVDV-specific antibodies in sheep serum?
Do AGID and commercial ELISAs accurately detect BVDV-specific antibodies in sheep serum?
AGID and commercial ELISAs can accurately detect BVDV antibodies in sheep serum, with optimized thresholds improving sensitivity and specificity to >95% for the ELISAs.
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AGID may aid BVDV serology in sheep; leaves open ELISA validation and threshold optimization in larger field studies.
Effective control and the eventual eradication of Bovine viral diarrhea virus (BVDV) from cattle populations depend on the accurate identification of infected animals. Although typically a disease agent of cattle, BVDV is known to infect a wide variety of nonbovine species, including sheep. However, validation of serologic tests in these nonbovine species, particularly sheep, is lacking. We analyzed 99 sheep sera (57 samples from Pestivirus-naive sheep, and 42 samples from BVDV-inoculated sheep) in order to investigate 3 serologic tests: the agarose gel immunodiffusion (AGID) and 2 commercial enzyme-linked immunosorbent assays (ELISAs) for detection of BVDV antibodies. At the manufacturer's cutoff thresholds, the AGID performed with 95.2% diagnostic sensitivity; ELISA-A performed with sensitivity of 90.5% and ELISA-B with 69.1%. All 3 tests performed with 100% diagnostic specificity. Two-graph receiver operating characteristic analysis showed that performance characteristics were optimized, such that both diagnostic sensitivity and diagnostic specificity were >95% for both ELISAs, if the thresholds were altered to 34.9% inhibition for ELISA-A and 63.5 signal-to-noise ratio for ELISA-B.
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Evans et al. (2017) studied this question.
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