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- W4308124856 abstract "Background and Objectives: New SARS-CoV-2 variants may impact the effectiveness of previously stored convalescent plasma (CCP). We defined levels of anti-delta and anti-omicron SARS-CoV-2 neutralizing antibodies (Nt-Abs) and investigated possible differences of past CCP Nt-Abs responses related to donor location in North and South Italy. Methods: Serum from 153 donors recovered from SARS-COV-2 infection (98 from northern and 55 from southern Italy) were analyzed for Nt-Abs characterization using our in house microneutralization assay. Results were compared to anti-Spike IgG measured by chemiluminescent assay (CLIA) to define a possible agreement with a more affordable test. Results: delta Nt-Abs titer in comparison to the reference strain (PV10734 D614G) showed a reduction of 82% in northern and 77% in southern Italy groups. Omicron Nt-Abs titer showed a reduction of 97%. CCP corresponding to Nt-Abs titer > 1:80 showed a median of 1365 BAU/mL for delta strain and 653 BAU/mL for reference strain. We found no statistical differences between Nt-Abs responses in North and South CCP donors. Conclusions: Not all past CCP could be used to treat patients with SARS-CoV-2 delta and omicron infections due to the lack of specific Nt-Abs. For the moment, the neutralization test remains the gold standard to select potential CCP donors. Interestingly, our study did not find NT-Abs differences between plasma collected from donors living in different areas of Italy." @default.
- W4308124856 created "2022-11-08" @default.
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- W4308124856 date "2022-10-31" @default.
- W4308124856 modified "2023-10-18" @default.
- W4308124856 title "Characterization of CCP: Can We Use Past Convalescent Plasma from COVID-19 Patients for Treatment of New Emerging Variants?" @default.
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- W4308124856 doi "https://doi.org/10.3390/covid2110112" @default.
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