title: Development and clinical evaluation of a recombinant-antigen-based cytomegalovirus immunoglobulin M automated immunoassay using the Abbott AxSYM analyzer.
abstract: A new microparticle enzyme immunoassay (MEIA), the Cytomegalovirus (CMV) Immunoglobulin M (IgM) test, was developed on the Abbott AxSYM analyzer. This test uses recombinant CMV antigens derived from portions of four structural and nonstructural proteins of CMV: pUL32 (pp150), pUL44 (pp52), pUL83 (pp65), and pUL80a (pp38). A total of 1, 608 specimens from random volunteer blood donors (n = 300), pregnant women (n = 1,118), transplant recipients (n = 6), and patients with various clinical conditions and disease states (n = 184) were tested during development and evaluation of this new assay. In a preliminary clinical evaluation we tested specimens collected prospectively from pregnant women (n = 799) and selected CMV IgM-positive archived specimens from pregnant women (n = 39). The results from the new CMV IgM immunoassay were compared to the results of a consensus interpretation of the results obtained with three commercial CMV IgM immunoassays. The results for specimens with discordant results were resolved by a CMV IgM immunoblot assay. The relative sensitivity, specificity, and agreement for the AxSYM CMV IgM assay were 94.29, 96.28, and 96.19%, respectively, and the resolved sensitivity, specificity, and agreement were 95.83, 97.47, and 97.37%, respectively. We also tested serial specimens from women who experienced seroconversion or a recent CMV infection during gestation (n = 17) and potentially cross-reactive specimens negative for CMV IgM antibody by the consensus tests (n = 184). The AxSYM CMV IgM assay was very sensitive for the detection of CMV IgM during primary CMV infection, as shown by the detection of CMV IgM at the same time as or just prior to the detection of CMV IgG. Specimens from individuals with lupus (n = 16) or parvovirus B19 infection (n = 6) or specimens containing hyper IgM (n = 9), hyper IgG (n = 8), or rheumatoid factor (n = 55) did not cross-react with the AxSYM assay. One specimen each from individuals infected with Epstein-Barr virus (n = 26), measles virus (n = 10), herpes simplex virus (n = 12), or varicella-zoster virus (n = 13) infection, one specimen from an influenza vaccinee (n = 14), and one specimen containing antinuclear antibody cross-reacted with the assay. The overall rate of cross-reactivity of the specimens with the assay was 3.3% (6 of 184). The AxSYM CMV IgM assay is a sensitive and specific assay for the detection of CMV-specific IgM.
authors.affiliation: Department of Congenital Infectious Disease Diagnostics, Abbott Laboratories, Abbott Park, IL 60064-6199, USA.
authors.forename: G T
authors.initials: GT
authors.lastname: Maine
authors.forename: R
authors.initials: R
authors.lastname: Stricker
authors.forename: M
authors.initials: M
authors.lastname: Schuler
authors.forename: J
authors.initials: J
authors.lastname: Spesard
authors.forename: S
authors.initials: S
authors.lastname: Brojanac
authors.forename: B
authors.initials: B
authors.lastname: Iriarte
authors.forename: K
authors.initials: K
authors.lastname: Herwig
authors.forename: T
authors.initials: T
authors.lastname: Gramins
authors.forename: B
authors.initials: B
authors.lastname: Combs
authors.forename: J
authors.initials: J
authors.lastname: Wise
authors.forename: H
authors.initials: H
authors.lastname: Simmons
authors.forename: T
authors.initials: T
authors.lastname: Gram
authors.forename: J
authors.initials: J
authors.lastname: Lonze
authors.forename: D
authors.initials: D
authors.lastname: Ruzicki
authors.forename: B
authors.initials: B
authors.lastname: Byrne
authors.forename: J D
authors.initials: JD
authors.lastname: Clifton
authors.forename: L E
authors.initials: LE
authors.lastname: Chovan
authors.forename: D
authors.initials: D
authors.lastname: Wachta
authors.forename: C
authors.initials: C
authors.lastname: Holas
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.forename: T
authors.initials: T
authors.lastname: Wilson
authors.forename: S
authors.initials: S
authors.lastname: Tomazic-Allen
authors.forename: M A
authors.initials: MA
authors.lastname: Clements
authors.forename: G L
authors.initials: GL
authors.lastname: Wright
authors.forename: T
authors.initials: T
authors.lastname: Lazzarotto
authors.forename: A
authors.initials: A
authors.lastname: Ripalti
authors.forename: M P
authors.initials: MP
authors.lastname: Landini
mesh_terms: D000914:Antibodies, Viral / Q000097:blood; D000956:Antigens, Viral / Q000235:genetics / Q000276:immunology*; D003429:Cross Reactions; D003587:Cytomegalovirus / Q000276:immunology*; D003586:Cytomegalovirus Infections / Q000175:diagnosis*; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D007075:Immunoglobulin M / Q000097:blood*; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000175:diagnosis / Q000821:virology; D011933:Reagent Kits, Diagnostic; D011993:Recombinant Fusion Proteins / Q000276:immunology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D007075:Immunoglobulin M; D011933:Reagent Kits, Diagnostic; D011993:Recombinant Fusion Proteins