Serologic evolution and follow-up to IgG antibodies of infants born to mothers with gestational COVID.

BACKGROUND: It is known that SARS-CoV-2 antibodies from pregnant women with SARS-CoV-2 infection during pregnancy cross the placenta but the duration and the protective effect of these antibodies in infants is scarce. METHODS: This prospective study included mothers with SARS-COV-2 infection during pregnancy and their infants from April 2020 to March 2021. IgG antibodies to SARS-CoV-2 spike protein were performed on women and infants at birth and at two and six months during follow-up. Anthropometrical measures and physical and neurological examinations and a clinical history of symptoms and COVID-19 diagnosis were collected. Simple linear regression was performed to compare categorical and continuous variables. To compare the mother's and infant's antibody titers evolution, a mixed linear regression model was used. A predictive model of newborn antibody titers at birth has been established by means of simple stepwise linear regression. RESULTS: 51 mother-infant couples were included. 45 (90%) of the mothers and 44 (86.3%) of the newborns had a positive serology al birth. These antibodies were progressively decreasing and were positive in 34 (66.7%) and 7 (13.7%) of infants at 2 and 6 months, respectively. IgG titers of newborns at birth were related to mothers' titers, with a positive moderate correlation (Pearson's correlation coefficient: 0.82, p < 0,001). Fetal/maternal antibodies placental transference rate was 1.3 (IQR: 0.7-2.2). The maternal IgG titers at delivery and the type of maternal infection (acute, recent, or past infection) was significantly related with infants' antibody titers at birth. No other epidemiological or clinical factors were related to antibodies titers. Neurodevelopment, psychomotor development, and growth were normal in 94.2% of infants in the third follow-up visit. No infants had a COVID-19 diagnosis during the follow-up period. CONCLUSIONS: Transplacental transfer of maternal antibodies is high in newborns from mothers with recent or past infection at delivery, but these antibodies decrease after the first months of life. Infant's IgG titers were related to maternal IgG titers at delivery. Further studies are needed to learn about the protective role of maternal antibodies in infants.

[Prenatal ultrasonic diagnosis and follow-up of fetal splenic cysts: report of two cases. Review of the literature]. / Diagnóstico ecográfico prenatal y seguimiento de quistes esplénicos fetales: a propósito de dos casos. Revisión de la bibliografía.

Congenital splenic cysts are rare entities wich are not frequently diagnosed in prenatal sonographies and there is only a few literature wich report these medical cases. The aim of this article is to introduce this sonographic discovery and study whether there are impacts for the newborn, association with cormosomopathy or fetal pathology. We describe two medical cases of fetal splenic cysts wich were diagnosed in our service by ultrasonography at 29 and 32 weeks of gestation, their antenatal monitoring and postnatal evolution. Besides theses, it is made a review of this entity in medical literature, examination about the: etiology, prenatal diagnosis, prenatal and postnatal following and complications. In conclusion, the congenital splenic cyst has a good prognosis with an spontaneous postnatal resolution in the majority of the cases. No association was observed between cromosopathy or fetal pathology with the examined cases.