{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T05:04:33Z","timestamp":1789103073815,"version":"build-2803163510"},"reference-count":44,"publisher":"American Society for Microbiology","issue":"8","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clin. Vaccine Immunol."],"published-print":{"date-parts":[[2014,8]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>The novel influenza A(H1N1)pdm09 virus caused an influenza pandemic in 2009. IgM, IgG, and IgA antibody responses to A(H1N1)pdm09 hemagglutinin (HA) following A(H1N1)pdm09 virus infection were analyzed to understand antibody isotype responses. Age-matched control sera collected from U.S. residents in 2007 and 2008 were used to establish baseline levels of cross-reactive antibodies. IgM responses often used as indicators of primary virus infection were mainly detected in young patient groups (\u22645 years and 6 to 15 years old), not in older age groups, despite the genetic and antigenic differences between the HA of A(H1N1)pdm09 virus and pre-2009 seasonal H1N1 viruses. IgG and IgA responses to A(H1N1)pdm09 HA were detected in all age groups of infected persons. In persons 17 to 80 years old, paired acute- and convalescent-phase serum samples demonstrated \u22654-fold increases in the IgG and IgA responses to A(H1N1)pdm09 HA in 80% and 67% of A(H1N1)pdm09 virus-infected persons, respectively. The IgG antibody response to A(H1N1)pdm09 HA was cross-reactive with HAs from H1, H3, H5, and H13 subtypes, suggesting that infections with subtypes other than A(H1N1)pdm09 might result in false positives by enzyme-linked immunosorbent assay (ELISA). Lower sensitivity compared to hemagglutination inhibition and microneutralization assays and the detection of cross-reactive antibodies against homologous and heterologous subtype are major drawbacks for the application of ELISA in influenza serologic studies.<\/jats:p>","DOI":"10.1128\/cvi.00129-14","type":"journal-article","created":{"date-parts":[[2014,5,29]],"date-time":"2014-05-29T05:13:55Z","timestamp":1401340435000},"page":"1054-1060","source":"Crossref","is-referenced-by-count":31,"title":["IgM, IgG, and IgA Antibody Responses to Influenza A(H1N1)pdm09 Hemagglutinin in Infected Persons during the First Wave of the 2009 Pandemic in the United States"],"prefix":"10.1128","volume":"21","author":[{"given":"Zhu-Nan","family":"Li","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seh-Ching","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul J.","family":"Carney","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ji","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Feng","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiuhua","family":"Lu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Merry","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Stevens","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Levine","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacqueline M.","family":"Katz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kathy","family":"Hancock","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","published-online":{"date-parts":[[2014,5,28]]},"reference":[{"key":"key20180919073739_B1","volume-title":"World now at the start of 2009 influenza pandemic: statement to the press by WHO Director-General Dr Margaret Chan","author":"World Health Organization","year":"2009"},{"key":"key20180919073739_B2","article-title":"Global alert and response (GAR)","volume-title":"Pandemic (H1N1) 2009\u2014update 2012","author":"World Health Organization","year":"2010"},{"key":"key20180919073739_B3","doi-asserted-by":"publisher","first-page":"197","DOI":"10.1126\/science.1176225","article-title":"Antigenic and genetic characteristics of swine-origin 2009 A(H1N1) influenza viruses circulating in humans","volume":"325","author":"Garten","year":"2009","journal-title":"Science"},{"key":"key20180919073739_B4","doi-asserted-by":"crossref","first-page":"540","DOI":"10.1128\/IAI.41.2.540-545.1983","article-title":"Hemagglutinin-specific antibody responses in immunoglobulin G, A, and M isotypes as measured by enzyme-linked immunosorbent assay after primary or secondary infection of humans with influenza A virus","volume":"41","author":"Burlington","year":"1983","journal-title":"Infect. 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