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Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Acta+Clin+Belg 2022 ; 77 (3): 653-657 Nephropedia Template TP
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Different long-term avidity maturation for IgG anti-spike and anti-nucleocapsid SARS-CoV-2 in hospitalized COVID-19 patients #MMPMID34152944
Acta Clin Belg 2022[Jun]; 77 (3): 653-657 PMID34152944show ga
INTRODUCTION: The high variability of SARS-CoV-2 serological response after COVID-19 infection hampers its use as indicator of the timing of infection. A potential alternative method is the determination of affinity maturation of SARS-CoV-2 IgG, expressed as the SARS-CoV-2 IgG avidity. METHODS: SARS-CoV-2 IgG concentration and avidity were measured in sera of hospitalized COVID-19 patients sampled at two weeks and >/=12 weeks post symptom onset using an in-house developed protocol based on EUROIMMUN (anti-spike) and EDI (anti-nucleocapsid) SARS-CoV-2 IgG ELISA protocols. RESULTS: We included 68 confirmed COVID-19 patients that tested positive for SARS-CoV-2 IgG in both the initial and follow-up specimen sampled at a median of 14 (range 10-18) days and 120 (range 84-189) days, respectively, post symptom onset. The median anti-spike and anti-nucleocapsid SARS-CoV-2 IgG avidity response was 40% (range 9-93%) and 72% (range 27-104%), respectively, for the first sample, and 66% (range 28-90%) and 57% (range 25-94%), respectively, for the second sample. The proportion of SARS-CoV-2 IgG avidity results >/=60% was significantly lower for anti-spike compared to anti-nucleocapsid IgG for initial samples (p< 0.01) and vice versa for follow-up samples (p< 0.01). CONCLUSION: Anti-nucleocapsid SARS-CoV-2 IgG maturation occurs faster and avidity decreases faster than anti-spike IgG, indicating different kinetics of anti-spike and anti-nucleocapsid IgG. Further, affinity maturation after SARS-CoV-2 infection is frequently incomplete.