{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T00:22:55Z","timestamp":1772583775461,"version":"3.50.1"},"reference-count":18,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2008,9,19]],"date-time":"2008-09-19T00:00:00Z","timestamp":1221782400000},"content-version":"vor","delay-in-days":262,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clinical Laboratory Analysis"],"published-print":{"date-parts":[[2008,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>As West Nile virus (WNV) has become endemic in the United States, following the first reported cases in New York during the summer of 1999, the demand for specific serology has increased. Several IgM capture ELISA assays for the detection of WNV\u2010specific IgM have been approved by the Food and Drug Administration for in vitro diagnostic testing, including kits from Focus Diagnostics and InBios International, Inc. The Focus Diagnostics IgM capture ELISA has a background subtraction protocol and the InBios IgM capture ELISA implements a ratio method to detect nonspecific reactivity due to rheumatoid factor, heterophile antibodies, and other interfering substances. We compared the InBios IgM capture ELISA with the Focus Diagnostics capture ELISA. Agreement, sensitivity, and specificity of the InBios IgM capture ELISA were 99, 98, and 100%, respectively. Samples that originally tested positive on the Focus Diagnostics IgM capture ELISA without the subtraction protocol and were then determined negative following the subtraction protocol agreed 100% with the InBios IgM capture ELISA. We conclude that a method to eliminate background reactivity is a necessary portion of any anti\u2010WNV IgM assay in order to eliminate false\u2010positive results. J. Clin. Lab. Anal. 22:362\u2013366, 2008. \u00a9 2008 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/jcla.20271","type":"journal-article","created":{"date-parts":[[2008,9,19]],"date-time":"2008-09-19T16:52:32Z","timestamp":1221843152000},"page":"362-366","source":"Crossref","is-referenced-by-count":11,"title":["Evaluation of a new commercial enzyme immunoassay for the detection of IgM antibodies to West Nile virus using a ratio method to eliminate nonspecific reactivity"],"prefix":"10.1002","volume":"22","author":[{"given":"Ryan J.","family":"Welch","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brian L.","family":"Anderson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christine M.","family":"Litwin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2008,9,19]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1473-3099(02)00368-7"},{"key":"e_1_2_1_3_2","doi-asserted-by":"crossref","first-page":"1235","DOI":"10.1093\/ajhp\/61.12.1235","article-title":"West Nile virus infection","volume":"61","author":"Guharoy R","year":"2004","journal-title":"Am J Health Syst Pharm"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.4269\/ajtmh.1940.s1-20.471"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM200106143442401"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.3201\/eid0804.010217"},{"key":"e_1_2_1_7_2","doi-asserted-by":"publisher","DOI":"10.3201\/eid0604.000401"},{"key":"e_1_2_1_8_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-59403-8_12"},{"key":"e_1_2_1_9_2","unstructured":"CDC.2003.Epidemic\/epizootic West Nile virus in the United States: Guidelines for surveillance. 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