Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Antibody Titer Levels in Pregnant Individuals after Infection, Vaccination, or Both

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Abstract

We examined differences in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibody responses in pregnant individuals with natural, vaccine-induced, or combined immunity. Participants had live or nonlive births between 2020 and 2022, were seropositive (SARS-CoV-2 spike protein, anti-S), and had available mRNA vaccination and infection information (n=260). We compared titer levels among three immunity profiles: 1) natural immunity (n=191), 2) vaccine-induced immunity (n=37), and 3) combined immunity (ie, natural and vaccine-induced immunity; n=32). We applied linear regression to compare anti-S titers between the groups, controlling for age, race and ethnicity, and time between vaccination or infection (whichever came last) and sample collection. Anti-S titers were 57.3%and 94.4%lower among those with vaccine-induced and natural immunity, respectively, compared with those with combined immunity (P<.001, P=.005).

Original languageEnglish
Pages (from-to)1199-1202
Number of pages4
JournalObstetrics and Gynecology
Volume141
Issue number6
DOIs
StatePublished - 1 Jun 2023

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