OBJECTIVE To investigate maternal immunoglobulin (IgM, IgG) response to SARS-CoV-2 infection during pregnancy and IgG transplacental transfer, to characterize neonatal antibody response to SARS-CoV-2 infection, and to longitudinally follow actively- and passively-acquired SARS-CoV-2 antibodies in infants. DESIGN A prospective observational study. SETTING A public healthcare system in Santa Clara County (CA, USA). PARTICIPANTS Women with SARS-CoV-2 infection during pregnancy and their infants were enrolled between April 15, 2020 and March 31, 2021. OUTCOMES SARS-CoV-2 serology analyses in the cord and maternal blood at delivery and longitudinally in infant blood between birth and 28 weeks of life. RESULTS Of 145 mothers who tested positive for SARS-CoV-2 during pregnancy, 86 had symptomatic infections: 78 with mild-moderate symptoms, and eight with severe-critical symptoms. Of the 147 newborns, two infants showed seroconversion at two weeks of age with high levels of IgM and IgG, including one premature infant with confirmed intrapartum infection. The seropositivity rates of the mothers at delivery was 65% (95% CI 0.56-0.73) and the cord blood was 58% (95% CI 0.49-0.66). IgG levels significantly correlated between the maternal and cord blood (Rs= 0.93, p< 0.0001). IgG transplacental transfer ratio was significantly higher when the first maternal positive PCR was 60-180 days before delivery compared to <60 days (1.2 vs. 0.6, p=<0.0001). Infant IgG negative conversion rate over follow-up periods of 1-4, 5-12, and 13-28 weeks were 8% (4/48), 12% (3/25), and 38% (5/13), respectively. The IgG seropositivity in the infants was positively related to IgG levels in the cord blood and persisted up to six months of age. CONCLUSIONS Maternal SARS-CoV-2 IgG is efficiently transferred across the placenta when infections occur more than two months before delivery. Maternally-derived passive immunity may protect infants up to six months of life. Neonates mount a strong antibody response to perinatal SARS-CoV-2 infection.

OBJECTIVETo determine whether nutritional supplementation during pregnancy is associated with a reduced risk of autism spectrum disorder (ASD) with and without intellectual disability in offspring. DESIGNObservational prospective cohort study using multivariable logistic regression, sibling controls, and propensity score matching. SETTINGStockholm County, Sweden. PARTICIPANTS 273 107 mother-child pairs identified through population registers. The study sample was restricted to children who were aged 4 to 15 years by the end of follow-up on 31 December 2011 and were born between 1996 and 2007. EXPOSURES Multivitamin, iron, and folic acid supplement use was reported at the first antenatal visit. MAIN OUTCOME MEASURE Diagnosis of ASD with and without intellectual disability in children determined from register data up to 31 December 2011. RESULTSPrevalence of ASD with intellectual disability was 0.26% (158 cases in 61 934) in the maternal multivitamin use group and 0.48% (430 cases in 90 480) in the no nutritional supplementation use group. Maternal multivitamin use with or without additional iron or folic acid, or both was associated with lower odds of ASD with intellectual disability in the child compared with mothers who did not use multivitamins, iron, and folic acid (odds ratio 0.69, 95% confidence interval 0.57 to 0.84). Similar estimates were found in propensity score matched (0.68, 0.54 to 0.86) and sibling control (0.77, 0.52 to 1.15) matched analyses, though the confidence interval for the latter association included 1.0 and was therefore not statistically significant. There was no consistent evidence that either iron or folic acid use were inversely associated with ASD prevalence. CONCLUSIONSMaternal multivitamin supplementation during pregnancy may be inversely associated with ASD with intellectual disability in offspring. Further scrutiny of maternal nutrition and its role in the cause of autism is recommended.

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The coronavirus (COVID-19) epidemic has put unprecedented stress on hospitals as well as skilled nursing facilities, where reside some of the most vulnerable individuals at high risk of mortality and complications of this infection. This report highlights the strategy and success of hospital infection prevention efforts to protect the residents of an in-hospital subacute unit with 24 at-risk patients with chronic pulmonary disease in northern California. Specific efforts are detailed, with results of surveillance testing reported, including both viral PCR and serological IgG assays. Implications for other long-term subacute care facilities are discussed, as well as advantages and specific challenges for ‘distinct part’ versus ‘free-standing’ subacute care units.

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