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• W4313429462 abstract "Abstract Importance Antenatal care provides unique opportunities to assess SARS-CoV-2 seroprevalence and antibody response duration after natural infection detected during pregnancy; transplacental antibody transfer may inform peripartum and neonatal protection. Objective Estimate seroprevalence and durability of antibodies from natural infection (anti-nucleocapsid (anti-N) IgG) among pregnant people, and evaluate transplacental transfer efficiency. Design Seroprevalence study: cross-sectional SARS-CoV-2 antibody screening among pregnant people December 9, 2020-June 19, 2021. Cohort study: Pregnant people screened anti-N IgG+ by Abbott Architect chemiluminescent immunoassay in seroprevalence study or identified through medical records with RT-PCR+ or antigen positive results enrolled in a prospective cohort December 9, 2020-June 30, 2022 to longitudinally measure anti-N IgG responses. We collected cord blood and assessed transplacental transfer of maternally-derived anti-N antibodies. Setting Three hospitals and 14 affiliated clinics providing antenatal and delivery care, Seattle, Washington metropolitan area. Participants Seroprevalence study: pregnant people were screened for SAR-CoV-2 anti-N IgG during routine care. Cohort study: Pregnant people with evidence of prior SARS-CoV-2 infection (screened anti-N IgG+ from seroprevalence study or identified with a RT-PCR+ or antigen positive result from medical records) were enrolled in a cohort study to longitudinally measure anti-N IgG responses. Exposure(s) (for observational studies) COVID-19 diagnosis, symptoms, and disease severity. Main Outcome(s) and Measure(s) Presence and durability of SARS-CoV-2 anti-N IgG, transplacental transfer of maternally-derived anti-N IgG. Results Of 1289 pregnant people screened in the seroprevalence study, 5% (65) tested SARS-CoV-2 anti-N IgG+, including 39 (60%) without prior RT-PCR+ or antigen positive results and 53 (82%) without symptoms. Among 89 participants enrolled in the cohort study, 73 (82%) had anti-N IgG+ results during pregnancy. Among 49 participants with delivery samples 33 (67%) were anti-N IgG negative by delivery. Of 24 remaining anti-N IgG+ at delivery with paired cord blood samples, 12 (50%) had efficient transplacental anti-N IgG antibody transfer. Median time from first anti-N IgG to below positive antibody threshold was 17 weeks and did not differ by prior RT-PCR+ or antigen positive status. Conclusions and Relevance Maternally-derived SARS-CoV-2 antibodies to natural infection may wane before delivery. Vaccines are recommended for pregnant persons to reduce severe illness and confer protection to infants." @default.
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• W4313429462 date "2022-12-30" @default.
• W4313429462 modified "2023-09-27" @default.
• W4313429462 title "SARS-CoV-2 seroprevalence and longitudinal antibody response following natural infection in pregnancy: a prospective cohort study" @default.
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• W4313429462 doi "https://doi.org/10.1101/2022.12.28.22284017" @default.
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