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Sawry, Shobna; Le Roux, Jean; Wolter, Nicole; Mbatha, Philile; Bhiman, Jinal; Balkus, Jennifer; von Gottberg, Anne; Cohen, Cheryl; Chersich, Matthew; Kekana, Malolo; Ndlovu, Thatcher; Shipalana, Angela; Mthimunye, Wendy; Patel, Faeezah; Gous, Hermien; Walaza, Sibongile; Tempia, Stefano; Rees, Helen; Fairlie, Lee
International journal of infectious diseases, 12/2022, Letnik: 125Journal Article
•A SARS-CoV-2 seroprevalence study was conducted after the second wave of COVID infections.•The study included pregnant women in two urban antenatal clinics in inner-city Johannesburg.•A total of 64% of pregnant women were SARS-CoV-2 seropositive; most (96.6%) were asymptomatic.•No association between HIV status and SARS-CoV-2 seropositivity was found.•Only 60% of pregnant women reported being willing to vaccinate. After South Africa's second wave of COVID-19, this study estimated the SARS-CoV-2 seroprevalence among pregnant women in inner-city Johannesburg, South Africa. In this cross-sectional survey, 500 pregnant women who were non-COVID-19-vaccinated (aged ≥12 years) were enrolled, and demographic and clinical data were collected. Serum samples were tested using the Wantai SARS-CoV-2 spike antibody enzyme-linked immunosorbent assay and Roche Elecsys® anti-SARS-CoV-2 nucleocapsid antibody assays. Seropositivity was defined as SARS-CoV-2 antibodies on either (primary) or both (secondary) assays. Univariate Poisson regression assessed risk factors associated with seropositivity. The median age was 27.4 years, and HIV prevalence was 26.7%. SARS-CoV-2 seroprevalence was 64.0% (95% confidence interval CI: 59.6-68.2%) on the primary and 54% (95% CI: 49.5-58.4%) on the secondary measure. Most (96.6%) women who were SARS-CoV-2-seropositive reported no symptoms. On the Roche assay, we detected lower seroprevalence among women living with HIV than women without HIV (48.9% vs 61.7%, P-value = 0.018), and especially low levels among women living with HIV with a clusters of differentiation 4 <350 cells/ml compared with women without immune suppression (22.2% vs 56.4%, prevalence rate ratio = 0.4; 95% CI: 0.2-0.9; P-value = 0.046). Pregnant women attending routine antenatal care had a high SARS-CoV-2 seroprevalence after the second wave in South Africa, and most had asymptomatic infections. Seroprevalence surveys in pregnant women present a feasible method of monitoring the course of the pandemic over time.
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