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To better control the transboundary spread of this virus and support WOAH reporting requirements, we developed and partially validated a TaqMan real-time qPCR assay (ISKNV104R) to detect all three genotypes of ISKNV, including the two genotypes that cause RSIVD. Parameters averaged across 48 experiments used a 10-fold dilution series of linearized plasmid DNA (10<jats:sup>7<\/jats:sup>\u201310<jats:sup>1<\/jats:sup> copies), carrying a fragment of the three-spot gourami iridovirus (TSGIV) hypothetical protein revealed that the assay was linear over 7 orders of magnitude (10<jats:sup>7<\/jats:sup>\u201310<jats:sup>1<\/jats:sup>), a mean efficiency of 99.97 \u00b1 2.92%, a mean correlation coefficient of 1.000 \u00b1 0.001, and a limit of detection (analytical sensitivity) of \u226410 copies of TSGIV DNA. The diagnostic sensitivity and specificity for the ISKNV104R qPCR assay was evaluated and compared to other published assays using a panel of 397 samples from 21 source populations with different prevalence of ISKNV infection (0\u2013100%). The diagnostic sensitivity and specificity for the ISKNV104R qPCR assay was 91.99% (87.28\u201395.6; 95% CI) and 89.8% (83.53\u201394.84). The latent class analysis showed that the ISKNV104R qPCR assay had similar diagnostic sensitivities and specificities with overlapping confidence limits compared to a second TaqMan qPCR assay and a SYBR green assay. This newly developed TaqMan assay represents a partially validated qPCR assay for the detection of the three genotypes of the species ISKNV. The ISKNV104R qPCR assay once fully validated, will serve as an improved diagnostic tool that can be used for ISKNV surveillance efforts and diagnosis in subclinical fish to prevent further spread of MCVs throughout the aquaculture and ornamental fish industries.<\/jats:p>","DOI":"10.1371\/journal.pone.0281292","type":"journal-article","created":{"date-parts":[[2023,2,3]],"date-time":"2023-02-03T18:38:55Z","timestamp":1675449535000},"page":"e0281292","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":12,"title":["Partial validation of a TaqMan quantitative polymerase chain reaction for the detection of the three genotypes of Infectious spleen and kidney necrosis virus"],"prefix":"10.1371","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8751-3356","authenticated-orcid":true,"given":"Samantha A.","family":"Koda","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kuttichantran","family":"Subramaniam","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul M.","family":"Hick","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evelyn","family":"Hall","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6383-5978","authenticated-orcid":true,"given":"Thomas B.","family":"Waltzek","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4749-4004","authenticated-orcid":true,"given":"Joy A.","family":"Becker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2023,2,3]]},"reference":[{"key":"pone.0281292.ref001","doi-asserted-by":"crossref","unstructured":"FAO. 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