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Detecting Waning Serological Response with Commercial Immunoassays: 18-Month Longitudinal Follow-up of Anti-SARS-CoV-2 Nucleocapsid Antibodies.
Nakagama, Yu; Komase, Yuko; Kaku, Natsuko; Nitahara, Yuko; Tshibangu-Kabamba, Evariste; Tominaga, Tomoyo; Tanaka, Hiroko; Yokoya, Tomoaki; Hosokawa, Minako; Kido, Yasutoshi.
  • Nakagama Y; Department of Parasitology, Graduate School of Medicine, Osaka City Universitygrid.261445.0, Osaka, Japan.
  • Komase Y; Research Center for Infectious Disease Sciences, Graduate School of Medicine, Osaka City Universitygrid.261445.0, Osaka, Japan.
  • Kaku N; Department of Respiratory Internal Medicine, St. Marianna University School of Medicine, Yokohama-city Seibu Hospital, Yokohama, Japan.
  • Nitahara Y; Department of Parasitology, Graduate School of Medicine, Osaka City Universitygrid.261445.0, Osaka, Japan.
  • Tshibangu-Kabamba E; Research Center for Infectious Disease Sciences, Graduate School of Medicine, Osaka City Universitygrid.261445.0, Osaka, Japan.
  • Tominaga T; Department of Parasitology, Graduate School of Medicine, Osaka City Universitygrid.261445.0, Osaka, Japan.
  • Tanaka H; Research Center for Infectious Disease Sciences, Graduate School of Medicine, Osaka City Universitygrid.261445.0, Osaka, Japan.
  • Yokoya T; Department of Parasitology, Graduate School of Medicine, Osaka City Universitygrid.261445.0, Osaka, Japan.
  • Hosokawa M; Research Center for Infectious Disease Sciences, Graduate School of Medicine, Osaka City Universitygrid.261445.0, Osaka, Japan.
  • Kido Y; Department of Health Management, St. Marianna University School of Medicine, Yokohama-city Seibu Hospital, Yokohama, Japan.
Microbiol Spectr ; 10(4): e0098622, 2022 08 31.
Article in English | MEDLINE | ID: covidwho-1962112
ABSTRACT
Past severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection is an important determinant of protection from reinfection and of postvaccine immune responses. Herein, we conducted a follow-up analysis of health care workers previously infected with coronavirus disease 2019 (COVID-19) with the aim of evaluating different immunoassays for their capability in detecting the waning anti-SARS-CoV-2 immune responses and accuracy in documenting past SARS-CoV-2 infections. We evaluated serum antinucleocapsid antibody levels in convalescent individuals following a 1.5-year interval from SARS-CoV-2 infection. Three different commercial immunoassays that qualitatively measure serum antibodies targeting the SARS-CoV-2 nucleocapsid protein, namely, the Abbott Architect SARS-CoV-2 IgG, the Euroimmun anti-SARS-CoV-2 NCP enzyme-linked immunosorbent assay (ELISA) IgG, and the Roche Elecsys anti-SARS-CoV-2, were tested for comparison of detectability. A total of 38 individuals consented to participating in this follow-up analysis. From assay to assay, seropositivity rate at 18 months from infection varied from lowest at 42% to highest at 92%. The Roche Elecsys immunoassay, dependent on the dual-antigen antibody detection method and tuned for the detection of high avidity antibodies, was most capable of accurately documenting past SARS-CoV-2 infections. Different immunoassays showed variable capability of determining previous infection status under waning antibody concentrations. Immunoassays with lower detection limits are to be selected, and adjusted thresholds are to be considered in order to maximize the tests' performance. IMPORTANCE Past SARS-CoV-2 infection is an important determinant of protection from reinfection and of postvaccine immune responses. Our results show that different immunoassays, by design, harbor variable capability of tracking SARS-CoV-2 infection under waning antibody concentrations. With each recovered patient standing at a unique time point along the decline curve of antibodies, precise estimation of COVID-19 cumulative incidence remains a challenge. Since future surveillance studies will be targeting more than ever heterogenous cohorts, selecting the appropriate immunoassay is crucial in order to assure reliable decisions about an individual's previous infection status.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: COVID-19 Type of study: Cohort study / Diagnostic study / Experimental Studies / Observational study / Prognostic study / Qualitative research Limits: Humans Language: English Journal: Microbiol Spectr Year: 2022 Document Type: Article Affiliation country: Spectrum.00986-22

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Full text: Available Collection: International databases Database: MEDLINE Main subject: COVID-19 Type of study: Cohort study / Diagnostic study / Experimental Studies / Observational study / Prognostic study / Qualitative research Limits: Humans Language: English Journal: Microbiol Spectr Year: 2022 Document Type: Article Affiliation country: Spectrum.00986-22