{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T23:35:57Z","timestamp":1792798557759,"version":"4.5.0"},"reference-count":16,"publisher":"American Society for Microbiology","issue":"3","license":[{"start":{"date-parts":[[2024,3,13]],"date-time":"2024-03-13T00:00:00Z","timestamp":1710288000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1128\/ASMCopyrightv2"},{"start":{"date-parts":[[2024,3,13]],"date-time":"2024-03-13T00:00:00Z","timestamp":1710288000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"funder":[{"name":"Providence-Boston Center for AIDS Research","award":["P30AI042853"],"award-info":[{"award-number":["P30AI042853"]}],"id":[{"id":"https:\/\/ror.org\/05n52x113","id-type":"ROR","asserted-by":"crossref"}]},{"name":"Providence-Boston Center for AIDS Research","award":["P30AI042853"],"award-info":[{"award-number":["P30AI042853"]}],"id":[{"id":"https:\/\/ror.org\/05n52x113","id-type":"ROR","asserted-by":"crossref"}]}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["J Clin Microbiol"],"published-print":{"date-parts":[[2024,3,13]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title\/>\n                    <jats:p>\n                      Interlaboratory agreement of viral load assays depends on the accuracy and uniformity of quantitative calibrators. Previous work demonstrated poor agreement of secondary cytomegalovirus (CMV) standards with nominal values. This study re-evaluated this issue among commercially produced secondary standards for both BK virus (BKV) and CMV, using digital polymerase chain reaction (dPCR) to compare the materials from three different manufacturers. Overall, standards showed an improved agreement compared to prior work, against nominal values in both log\n                      <jats:sub>10<\/jats:sub>\n                      copies\/mL and log\n                      <jats:sub>10<\/jats:sub>\n                      international unit (IU)\/mL, with bias from manufacturer-assigned nominal values of 0.0\u20130.9 log\n                      <jats:sub>10<\/jats:sub>\n                      units (either copies or IU)\/mL. Standards normalized to IU and those values assigned by dPCR rather than by real-time PCR (qPCR) showed better agreement with nominal values. The latter reinforces prior conclusions regarding the utility of using such methods for quantitative value assignment in reference materials. Quantitative standards have improved over the last several years, and the remaining bias from nominal values might be further reduced by universal implementation of dPCR methods for value assignment, normalized to IU.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>IMPORTANCE<\/jats:title>\n                    <jats:p>Interlaboratory agreement of viral load assays depends on accuracy and uniformity of quantitative calibrators. Previous work, published in JCM several years ago, demonstrated poor agreement of secondary cytomegalovirus (CMV) standards with nominal values. This study re-evaluated this issue among commercially produced secondary standards for both BK virus (BKV) and CMV, using digital polymerase chain reaction (dPCR) to compare the materials from three different manufacturers. Overall, standards showed an improved agreement compared to prior work, against nominal values, indicating a substantial improvement in the production of accurate secondary viral standards, while supporting the need for further work in this area and for the broad adaption of international unit (IU) as a reporting standard for quantitative viral load results.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1128\/jcm.01669-23","type":"journal-article","created":{"date-parts":[[2024,2,21]],"date-time":"2024-02-21T09:00:36Z","timestamp":1708506036000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":8,"title":["Accuracy of quantitative viral secondary standards: a re-examination"],"prefix":"10.1128","volume":"62","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3073-4115","authenticated-orcid":true,"given":"R. T.","family":"Hayden","sequence":"first","affiliation":[{"name":"Department of Pathology, St. Jude Children\u2019s Research Hospital, Memphis, Tennessee, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Y.","family":"Su","sequence":"additional","affiliation":[{"name":"Department of Biostatistics, St. Jude Children\u2019s Research Hospital, Memphis, Tennessee, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L.","family":"Tang","sequence":"additional","affiliation":[{"name":"Department of Biostatistics, St. Jude Children\u2019s Research Hospital, Memphis, Tennessee, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.","family":"Zhu","sequence":"additional","affiliation":[{"name":"Department of Pathology, St. Jude Children\u2019s Research Hospital, Memphis, Tennessee, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Z.","family":"Gu","sequence":"additional","affiliation":[{"name":"Department of Pathology, St. Jude Children\u2019s Research Hospital, Memphis, Tennessee, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H. L.","family":"Glasgow","sequence":"additional","affiliation":[{"name":"Department of Pathology, St. Jude Children\u2019s Research Hospital, Memphis, Tennessee, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4162-0498","authenticated-orcid":true,"given":"S. S.","family":"Sam","sequence":"additional","affiliation":[{"name":"Division of Infectious Diseases, Alpert Medical School of Brown University, Providence, Rhode Island, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. M.","family":"Caliendo","sequence":"additional","affiliation":[{"name":"Department of Medicine, Alpert Medical School of Brown University, Providence, Rhode Island, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.01252-07"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.00258-08"},{"key":"e_1_3_3_4_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-6143.2008.02513.x"},{"key":"e_1_3_3_5_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-6143.2008.02514.x"},{"key":"e_1_3_3_6_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.01287-11"},{"key":"e_1_3_3_8_2","unstructured":"International standard 1ST WHO international standard for human cytomegalovirus for nucleic acid amplification techniques instructions for use on national Institute for biological standards and control. 2014. Available from: https:\/\/nibsc.org\/documents\/ifu\/09-162.pdf"},{"key":"e_1_3_3_10_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.00782-20"},{"key":"e_1_3_3_11_2","doi-asserted-by":"publisher","DOI":"10.1093\/cid\/ciw370"},{"key":"e_1_3_3_12_2","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.03375-14"},{"key":"e_1_3_3_13_2","doi-asserted-by":"publisher","DOI":"10.2353\/jmoldx.2010.090067"},{"key":"e_1_3_3_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.bdq.2016.04.001"},{"key":"e_1_3_3_15_2","doi-asserted-by":"publisher","DOI":"10.1128\/jcm.01338-22"},{"key":"e_1_3_3_16_2","doi-asserted-by":"publisher","DOI":"10.1021\/ac103230c"},{"key":"e_1_3_3_17_2","doi-asserted-by":"publisher","DOI":"10.1373\/clinchem.2014.221366"},{"key":"e_1_3_3_18_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ymeth.2012.07.021"},{"key":"e_1_3_3_19_2","doi-asserted-by":"publisher","DOI":"10.1021\/acs.analchem.9b03625"}],"container-title":["Journal of Clinical Microbiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.asm.org\/doi\/pdf\/10.1128\/jcm.01669-23","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.asm.org\/doi\/pdf\/10.1128\/jcm.01669-23","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,5,15]],"date-time":"2024-05-15T19:29:03Z","timestamp":1715801343000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.asm.org\/doi\/10.1128\/jcm.01669-23"}},"subtitle":[],"editor":[{"given":"Elitza S.","family":"Theel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"editor"}]}],"short-title":[],"issued":{"date-parts":[[2024,3,13]]},"references-count":16,"journal-issue":{"issue":"3","published-print":{"date-parts":[[2024,3,13]]}},"alternative-id":["10.1128\/jcm.01669-23"],"URL":"https:\/\/doi.org\/10.1128\/jcm.01669-23","relation":{},"ISSN":["0095-1137","1098-660X"],"issn-type":[{"value":"0095-1137","type":"print"},{"value":"1098-660X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,3,13]]},"assertion":[{"value":"2023-12-14","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2024-01-24","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2024-02-21","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e01669-23"}}