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  1. Article ; Online: Characterization of Serum Samples With Discordant Results in 2 Herpes Simplex Virus Type 2 IgG Assays.

    Prince, Harry E / Batterman, Hollis J / Marlowe, Elizabeth M

    Sexually transmitted diseases

    2022  Volume 49, Issue 5, Page(s) 353–359

    Abstract: Background: Our laboratory system tests sera for herpes simplex virus type 2 (HSV-2) IgG using the DiaSorin Liaison chemiluminescent immunoassay (CIA), with the option to confirm positive samples by a laboratory-developed HerpeSelect inhibition assay. ... ...

    Abstract Background: Our laboratory system tests sera for herpes simplex virus type 2 (HSV-2) IgG using the DiaSorin Liaison chemiluminescent immunoassay (CIA), with the option to confirm positive samples by a laboratory-developed HerpeSelect inhibition assay. As part of the confirmation process, the HerpeSelect HSV-2 IgG enzyme immunoassay (EIA) is performed. This study investigated the relationship between DiaSorin HSV-2 IgG CIA-positive indices and HerpeSelect HSV-2 IgG EIA results.
    Methods: HerpeSelect HSV-2 IgG EIA results were compiled for a cohort of consecutive DiaSorin HSV-2 IgG CIA-positive (index ≥1.10) samples. To further characterize DiaSorin CIA-positive samples that were positive (concordant) or negative (discordant) by the HerpeSelect EIA, a separate composite reference study panel was constructed and also tested using the Biokit HSV-2 IgG assay and an HSV-2 IgG inhibition assay developed for the DiaSorin instrument. Samples were classified as DiaSorin HSV-2 IgG true positive or false positive based on a composite reference using HerpeSelect EIA, Biokit, and DiaSorin inhibition results.
    Results: Of 2305 consecutive DiaSorin HSV-2 IgG CIA-positive samples, 411 (17.8%) were HerpeSelect HSV-2 IgG EIA negative; 343 of 411 (83%) had DiaSorin indices of 1.10 to 3.00. For the composite reference study panel (N = 120), 59 of 60 discordant samples were classified as DiaSorin HSV-2 IgG false positive based on the composite reference, whereas 58 of 60 concordant samples were classified as true positive.
    Conclusions: Nearly all DiaSorin HSV-2 IgG CIA-positive but HerpeSelect HSV-2 IgG EIA-negative sera are falsely positive in the DiaSorin CIA. Furthermore, most DiaSorin false-positive samples exhibit low-positive indices, suggesting that guidelines for confirmatory testing should include low-positive samples by CIA and EIA.
    MeSH term(s) Antibodies, Viral ; Enzyme-Linked Immunosorbent Assay/methods ; Female ; Herpes Genitalis/diagnosis ; Herpes Simplex/diagnosis ; Herpesvirus 2, Human ; Humans ; Immunoglobulin G ; Male ; Sensitivity and Specificity
    Chemical Substances Antibodies, Viral ; Immunoglobulin G
    Language English
    Publishing date 2022-01-24
    Publishing country United States
    Document type Journal Article
    ZDB-ID 435191-5
    ISSN 1537-4521 ; 0148-5717
    ISSN (online) 1537-4521
    ISSN 0148-5717
    DOI 10.1097/OLQ.0000000000001603
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Transience of interference in an immunoassay measuring serum levels of beta-D-glucan.

    Prince, Harry E / Batterman, Hollis J / Realegeno, Susan E / Marlowe, Elizabeth M

    Diagnostic microbiology and infectious disease

    2022  Volume 102, Issue 4, Page(s) 115630

    Abstract: Some sera tested for 1-3-beta-D-glucan to identify invasive fungal infections exhibit interference. To assess interference transience, we evaluated results for 426 patients with an interference sample followed by a later sample. Interference was ... ...

    Abstract Some sera tested for 1-3-beta-D-glucan to identify invasive fungal infections exhibit interference. To assess interference transience, we evaluated results for 426 patients with an interference sample followed by a later sample. Interference was transient for 73% of patients (later sample negative or positive); median time between samples was 8 days.
    MeSH term(s) Glucans ; Humans ; Immunoassay ; Invasive Fungal Infections ; Proteoglycans ; beta-Glucans
    Chemical Substances Glucans ; Proteoglycans ; beta-Glucans
    Language English
    Publishing date 2022-01-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 604920-5
    ISSN 1879-0070 ; 0732-8893
    ISSN (online) 1879-0070
    ISSN 0732-8893
    DOI 10.1016/j.diagmicrobio.2021.115630
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Relationship between hepatitis C virus (HCV) IgG index values and quantitative HCV RNA results in HCV IgG-reactive serum samples.

    Prince, Harry E / Marlowe, Elizabeth M / Schwab, Dale S

    Diagnostic microbiology and infectious disease

    2021  Volume 100, Issue 1, Page(s) 115311

    Abstract: Centers for Disease Control guidelines recommend hepatitis C virus (HCV) RNA testing of all HCV IgG-reactive samples, although earlier studies found that IgG-reactive samples with low indices were negative in qualitative RNA assays. To determine if ... ...

    Abstract Centers for Disease Control guidelines recommend hepatitis C virus (HCV) RNA testing of all HCV IgG-reactive samples, although earlier studies found that IgG-reactive samples with low indices were negative in qualitative RNA assays. To determine if previous study results could be confirmed using current real-time RT-PCR technology, we investigated the relationship between HCV IgG index (Ortho VITROS) and quantitative HCV RNA results (cobas HCV) for 2368 consecutive IgG-reactive sera. Results were segregated into Low (1.00-16.0), Medium (16.1-30.0), and High (>30.0) IgG index groups. Although median viral load (VL) of RNA-positive samples was similar in all 3 groups, the percentage with low VL (1.18-4.16 log IU/mL) was increased for the Low group. Further analysis of the Low group revealed that 23 of 370 (6%) samples with IgG indices ≤8.00 were RNA-positive, and 13/23 (57%) had low VL. Our analysis supports the Centers for Disease Control recommendation to test all HCV IgG-reactive sera for HCV RNA.
    MeSH term(s) Female ; Hepacivirus/genetics ; Hepacivirus/immunology ; Hepatitis C/diagnosis ; Hepatitis C/immunology ; Hepatitis C/virology ; Hepatitis C Antibodies/blood ; Humans ; Immunoglobulin G/blood ; Male ; Middle Aged ; RNA, Viral/blood ; RNA, Viral/genetics ; Real-Time Polymerase Chain Reaction/methods ; Viral Load/methods
    Chemical Substances Hepatitis C Antibodies ; Immunoglobulin G ; RNA, Viral
    Language English
    Publishing date 2021-01-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 604920-5
    ISSN 1879-0070 ; 0732-8893
    ISSN (online) 1879-0070
    ISSN 0732-8893
    DOI 10.1016/j.diagmicrobio.2021.115311
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Relationship between DiaSorin Liaison Treponema pallidum antibody indices and confirmatory assay results in the reverse syphilis testing algorithm.

    Prince, Harry E / Marlowe, Elizabeth M / Schwab, Dale A

    Diagnostic microbiology and infectious disease

    2020  Volume 100, Issue 1, Page(s) 115303

    Abstract: Published studies show that >99% of sera reactive in the reverse syphilis testing algorithm (RSTA) screening assay with an index above an assay-specific threshold confirm as reactive, with either a rapid plasma reagin-reactive ( ... ...

    Abstract Published studies show that >99% of sera reactive in the reverse syphilis testing algorithm (RSTA) screening assay with an index above an assay-specific threshold confirm as reactive, with either a rapid plasma reagin-reactive (RPR
    MeSH term(s) Adult ; Algorithms ; Antibodies, Bacterial/blood ; Female ; Humans ; Immunoassay ; Linear Models ; Male ; Syphilis/diagnosis ; Syphilis/immunology ; Syphilis/microbiology ; Syphilis Serodiagnosis/methods ; Syphilis Serodiagnosis/standards ; Treponema pallidum/immunology
    Chemical Substances Antibodies, Bacterial
    Language English
    Publishing date 2020-12-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 604920-5
    ISSN 1879-0070 ; 0732-8893
    ISSN (online) 1879-0070
    ISSN 0732-8893
    DOI 10.1016/j.diagmicrobio.2020.115303
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Concordance of Results by Three Chagas Disease Antibody Assays in U.S. Clinical Specimens.

    Moser, Matthew S / Fleischmann, Charles J / Kelly, Emily A / Prince, Harry E / Bern, Caryn / Whitman, Jeffrey D

    Journal of clinical microbiology

    2023  Volume 61, Issue 3, Page(s) e0181422

    MeSH term(s) Humans ; Chagas Disease/diagnosis ; Trypanosoma cruzi/genetics ; Antibodies, Protozoan ; Enzyme-Linked Immunosorbent Assay/methods
    Chemical Substances Antibodies, Protozoan
    Language English
    Publishing date 2023-02-28
    Publishing country United States
    Document type Letter ; Research Support, Non-U.S. Gov't
    ZDB-ID 390499-4
    ISSN 1098-660X ; 0095-1137
    ISSN (online) 1098-660X
    ISSN 0095-1137
    DOI 10.1128/jcm.01814-22
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Herpes simplex virus type 2 (HSV-2) IgG index values in two immunoassays in relation to HSV-2 IgG inhibition assay results.

    Prince, Harry E / Batterman, Hollis J / Schwab, Dale A

    Diagnostic microbiology and infectious disease

    2019  Volume 95, Issue 3, Page(s) 114864

    Abstract: CDC guidelines recommend confirmatory testing of sera with low-positive indices (1.10-3.50) in the HerpeSelect® (HSLT) HSV-2 IgG screening assay. To determine if this recommendation is adequate for our patient population, we reviewed HSLT HSV-2 IgG ... ...

    Abstract CDC guidelines recommend confirmatory testing of sera with low-positive indices (1.10-3.50) in the HerpeSelect® (HSLT) HSV-2 IgG screening assay. To determine if this recommendation is adequate for our patient population, we reviewed HSLT HSV-2 IgG screening indices for 262 screen-positive sera (index >1.10) tested in our confirmatory assay, which assesses inhibition of binding to recombinant gG2 by HSV-1- and HSV-2-infected cell lysates. To determine how the recommendation affects other screening assays, we tested these samples in the Liaison® HSV-2 IgG assay. Of 124 false-positive sera, 20% and 39% had an index >3.50 in the HSLT and Liaison screening assays, respectively. In both assays, 51% of 63 indeterminate sera (inhibition by HSV-1 lysate) had indices >3.50. Similarly, ≥75% of 75 true-positive samples exhibited indices >3.50 in both assays. Thus, confirmatory testing only of sera with low-positive HSV-2 IgG indices misses some false-positive and indeterminate samples, leading to misdiagnosis of HSV-2 infection.
    MeSH term(s) Antibodies, Viral/blood ; False Positive Reactions ; Herpes Genitalis/diagnosis ; Herpesvirus 1, Human/immunology ; Herpesvirus 2, Human/immunology ; Herpesvirus 2, Human/isolation & purification ; Humans ; Immunoassay/standards ; Immunoglobulin G/blood ; Serologic Tests/standards ; Viral Envelope Proteins/immunology
    Chemical Substances Antibodies, Viral ; Immunoglobulin G ; Viral Envelope Proteins
    Language English
    Publishing date 2019-07-13
    Publishing country United States
    Document type Comparative Study ; Journal Article
    ZDB-ID 604920-5
    ISSN 1879-0070 ; 0732-8893
    ISSN (online) 1879-0070
    ISSN 0732-8893
    DOI 10.1016/j.diagmicrobio.2019.07.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Duration of West Nile Virus Immunoglobulin M Antibodies up to 81 Months Following West Nile Virus Disease Onset.

    Staples, J Erin / Gibney, Katherine B / Panella, Amanda J / Prince, Harry E / Basile, Alison J / Laven, Janeen / Sejvar, James J / Fischer, Marc

    The American journal of tropical medicine and hygiene

    2022  

    Abstract: West Nile virus (WNV) IgM antibodies typically indicate a recent infection. However, WNV IgM antibodies can remain detectable for months to years following illness onset. We found that 23% (11/47) of samples tested with a WNV ELISA and 43% (20/47) of ... ...

    Abstract West Nile virus (WNV) IgM antibodies typically indicate a recent infection. However, WNV IgM antibodies can remain detectable for months to years following illness onset. We found that 23% (11/47) of samples tested with a WNV ELISA and 43% (20/47) of samples tested with WNV microsphere immunoassay (MIA) at 16-19 months following WNV illness onset were positive for IgM antibodies. The proportion of samples testing positive for WNV IgM by ELISA decreased over time, but 5% (2/44) of individuals remained positive at 60-63 months after their acute illness and 4% (2/50) were WNV IgM equivocal at 72-81 months. Testing by MIA showed the same general trend of decreased proportion positive over time though the rates of positivity were higher at most time points compared with the ELISA, including 6% (3/50) of participant's samples identified as IgM positive by MIA at 72-81 months post their acute illness. With the MIA, there also was a high proportion of samples with nonspecific results at each time point; average of 23% across all time points. Clinicians and public health officials should consider these findings along with clinical and epidemiologic data when interpreting WNV IgM antibody test results.
    Language English
    Publishing date 2022-04-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2942-7
    ISSN 1476-1645 ; 0002-9637
    ISSN (online) 1476-1645
    ISSN 0002-9637
    DOI 10.4269/ajtmh.21-1234
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Evaluation of a multiplex bead immunoassay for determination of immune status to varicella-zoster virus in medical center students and employees.

    Loeffelholz, Michael J / Prince, Harry E

    Clinical and vaccine immunology : CVI

    2015  Volume 22, Issue 3, Page(s) 351–353

    Abstract: This study evaluated an enzyme immunoassay, a multiplex bead immunoassay (MBIA), and the anticomplement immunofluorescence (ACIF) test for detecting varicella-zoster virus IgG antibodies in sera from medical center students and employees. The agreement ... ...

    Abstract This study evaluated an enzyme immunoassay, a multiplex bead immunoassay (MBIA), and the anticomplement immunofluorescence (ACIF) test for detecting varicella-zoster virus IgG antibodies in sera from medical center students and employees. The agreement between methods was ≥95%. The MBIA was less sensitive than was the ACIF test, with a negative predictive value of 66.7%.
    MeSH term(s) Antibodies, Viral/blood ; Female ; Fluorescent Antibody Technique ; Health Personnel ; Herpesvirus 3, Human/immunology ; Humans ; Immunoassay/methods ; Immunoenzyme Techniques/methods ; Immunoglobulin G/blood ; Male ; Predictive Value of Tests ; Sensitivity and Specificity ; Students, Health Occupations ; Students, Medical
    Chemical Substances Antibodies, Viral ; Immunoglobulin G
    Language English
    Publishing date 2015-03
    Publishing country United States
    Document type Evaluation Studies ; Journal Article
    ZDB-ID 2221082-9
    ISSN 1556-679X ; 1556-6811
    ISSN (online) 1556-679X
    ISSN 1556-6811
    DOI 10.1128/CVI.00561-14
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Reactivity of human IgM binding murine monoclonal 6B6C1 (IgG2a) with other murine monoclonal IgG antibodies.

    Prince, Harry E / Yeh, Cindy

    Journal of clinical laboratory analysis

    2013  Volume 27, Issue 1, Page(s) 27–30

    Abstract: Background: Approximately 6% of sera positive in a dengue virus IgM-capture enzyme immunoassay (EIA) represent false-positives due to interaction between IgM and horseradish peroxidase (HRP)-labeled monoclonal antibody (MAb) 6B6C1 (IgG2a). To better ... ...

    Abstract Background: Approximately 6% of sera positive in a dengue virus IgM-capture enzyme immunoassay (EIA) represent false-positives due to interaction between IgM and horseradish peroxidase (HRP)-labeled monoclonal antibody (MAb) 6B6C1 (IgG2a). To better understand this interaction, we assessed the reactivity of captured IgM from these sera with other HRP-labeled MAbs.
    Methods: Fifty dengue IgM false-positive sera (recognizing 6B6C1) were evaluated for IgM reactivity with the HRP-labeled MAbs H3A4 (IgG2a), 53.8 (IgG2b), and IL-A2 (IgG1). The sera were also tested in an EIA for human anti-mouse antibody (HAMA).
    Results: Forty-three sera (86%) reacted with IgG2a MAb (H3A4). Most (31/43 = 72%) of these sera recognizing 6B6C1 and H3A4 also recognized the IgG2 MAb and/or the IgG1 MAb. In contrast, HAMA was increased in only 9 of 50 (18%) sera reacting with 6B6C1.
    Conclusions: IgM from most sera-binding IgG2a MAb 6B6C1 also binds another IgG2a MAb, suggesting that IgM-6B6C1 reactivity is not idiotype specific. In many cases, IgM recognizing 6B6C1 also binds MAbs of other IgG subclasses, but is negative in a HAMA assay. These findings indicate that samples positive in IgM-capture EIAs utilizing conjugated MAbs should always be retested in the absence of antigen to identify false-positive reactivity caused by direct IgM-MAb interaction.
    MeSH term(s) Animals ; Antibodies, Monoclonal/chemistry ; Antibodies, Monoclonal/metabolism ; Antibody Specificity ; Dengue/blood ; Dengue/diagnosis ; Dengue/immunology ; False Positive Reactions ; Humans ; Immunoenzyme Techniques/methods ; Immunoenzyme Techniques/standards ; Immunoglobulin G/chemistry ; Immunoglobulin G/metabolism ; Immunoglobulin M/blood ; Immunoglobulin M/chemistry ; Immunoglobulin M/metabolism ; Mice ; Protein Binding
    Chemical Substances Antibodies, Monoclonal ; Immunoglobulin G ; Immunoglobulin M
    Language English
    Publishing date 2013-01-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 645095-7
    ISSN 1098-2825 ; 0887-8013
    ISSN (online) 1098-2825
    ISSN 0887-8013
    DOI 10.1002/jcla.21557
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Impact of the Yosemite hantavirus outbreak on hantavirus antibody testing at a national reference laboratory.

    Prince, Harry E / Lieberman, Jay M

    Clinical and vaccine immunology : CVI

    2013  Volume 20, Issue 8, Page(s) 1213–1216

    Abstract: In conjunction with the 2012 Yosemite hantavirus outbreak, the number of sera our facility tested for hantavirus antibodies increased. We tracked test results and used the data set to determine if a more efficient testing algorithm was possible. Sera ... ...

    Abstract In conjunction with the 2012 Yosemite hantavirus outbreak, the number of sera our facility tested for hantavirus antibodies increased. We tracked test results and used the data set to determine if a more efficient testing algorithm was possible. Sera were screened using laboratory-developed pan-hantavirus IgG and IgM enzyme immunoassays (EIAs), with an index of >1.10 defined as positive. Sera that were IgM positive by screening (screen IgM(+)) were tested for Sin Nombre virus (SNV)-specific IgM using a laboratory-developed EIA; screen IgM(+) IgG(+) sera were also tested for SNV IgG using a laboratory-developed immunoblot assay. SNV antibody-positive samples were sent to state public health laboratories (PHL) or the CDC for confirmation. Of 3,946 sera tested from July through December 2012, 205 were screen IgM(+) IgG negative (IgG(-)); 7/205 were SNV IgM(+), but only 1/5 sent to PHL/CDC was confirmed as SNV IgM(+). Of 61 screen IgM(+) IgG(+) sera, 16 were SNV antibody positive; 13/16 sera (from 11 patients) went to PHL/CDC, where SNV infection was confirmed for all patients. Of 12 confirmed patients, 7 had been exposed at Yosemite. A modified algorithm defining screen indices of ≥2.00 as positive identified 11/12 confirmed cases while reducing the number of sera requiring SNV-specific antibody testing by 65%; the patient missed was not tested until 3 months after the onset of symptoms. Hantavirus antibody testing at our facility identified 12 SNV-infected patients, including 7 exposed at Yosemite. Some screen IgM(+) IgG(-) SNV IgM(+) results were false positives, emphasizing the value of PHL/CDC confirmatory testing. We identified a modified algorithm requiring analysis of fewer specimens for SNV-specific antibodies without loss of sensitivity.
    MeSH term(s) Algorithms ; Antibodies, Viral/blood ; Clinical Laboratory Techniques/methods ; Disease Outbreaks ; Hantavirus Infections/diagnosis ; Humans ; Immunoassay/methods ; Immunoglobulin G/blood ; Immunoglobulin M/blood ; Sin Nombre virus/immunology ; United States/epidemiology ; Veterinary Medicine/methods
    Chemical Substances Antibodies, Viral ; Immunoglobulin G ; Immunoglobulin M
    Language English
    Publishing date 2013-06-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2221082-9
    ISSN 1556-679X ; 1556-6811
    ISSN (online) 1556-679X
    ISSN 1556-6811
    DOI 10.1128/CVI.00326-13
    Database MEDical Literature Analysis and Retrieval System OnLINE

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