Abstract
Despite the prevalence and significant concern of COVID-19 in maternal and offspring health, little is known about the impact of COVID-19 during pregnancy on newborn immunity and neurodevelopment. This study aimed to examine 1) the relationship between maternal COVID-19 during pregnancy and newborn immune profiles and investigate the 2) associations between specific newborn immune profiles and the risk of subsequent diagnosis of a neurodevelopmental disorder (NDD) among children with prenatal exposure to COVID-19. Newborn dried bloodspots (NBS) from 545 children born at Kaiser Permanente Northern California between January 2020 and September 2021 (460 [223 males, 237 females] to COVID-19-infected [COVID+] mothers; 85 [45 males, 40 females] to COVID-19-uninfected [COVID-] mothers) were used to profile newborn immune molecules via a 42-plex cytokine/chemokine assay. Among the 460 children born to COVID+ mothers, 73 (47 males, 27 females) were later diagnosed with an NDD. In the first set of analyses examining the association between maternal COVID-19 infection during pregnancy and newborn immune profile, the results adjusted for covariates but uncorrected for multiple comparisons showed that newborns of COVID+ mothers had significantly higher levels of IL-22 (estimate [est.] = 0.16, 95 % Cl 0.01, 0.3, p = 0.04) and GM-CSF (est. = 0.27, 95 % Cl 0.09, 0.46, p = 0.004) compared to newborns of COVID- mothers. These differences were no longer statistically significant after multiple comparison adjustments. In the second analysis exploring the association between newborn profile and later diagnosis of NDD among newborns born to COVID+ mothers, the results adjusted for covariates revealed an association between higher neonatal levels of IL-22 (hazard ratio [HR] = 0.49, 95 % Cl 0.33, 0.75, p = 0.001) and lower risk of a later diagnosis of an NDD, which remained significant after multiple comparison adjustments (p = 0.04). Other neonatal cytokines/chemokines/growth factors such as sCD40L (HR = 0.7, 95 % Cl 0.57, 0.9, p = 0.009), IP-10 (HR = 0.46, 95 % Cl 0.25, 0.83, p = 0.009), MIG (HR = 0.52, 95 % Cl 0.3, 0.9, p = 0.02), FLT-3L (HR = 0.45, 95 % Cl 0.24, 0.83, p = 0.01), PDGF AB/BB (HR = 0.56, 95 % Cl 0.36, 0.99, p = 0.046), VEGF (HR = 0.57, 95 % Cl 0.34, 0.98, p = 0.04), and IL-4 (HR = 0.48, 95 % Cl 0.26, 0.93, p = 0.03) were no longer statistically significant after multiple comparison adjustments. Despite the imbalance between the number of COVID-19 exposed and unexposed newborns in this study cohort, our novel findings enhance our understanding of the potential impact of maternal COVID-19 infection during pregnancy on the developing neonatal immune system. Our findings highlight the role of immune molecules, beyond those considered to be pro-inflammatory, that may be crucial in maternal and newborn immunity against COVID-19 infection during pregnancy. Furthermore, our results suggest that reduced levels of neonatal immune molecules in newborns of COVID + mothers may be linked to an increased risk of a subsequent diagnosis of an NDD.