High antibody levels seen in newborns of COVID-19 survivors

A mother's COVID-19 antibodies can cross the placenta, potentially protecting her fetus from infection, researchers reported  in JAMA Pediatrics. Several weeks after the mother's infection begins, antibody levels in umbilical cord blood "can be as high as - or even higher - than the levels in maternal blood," said study leaders Dr. Karen Puopolo and Dr. Scott Hensley of the University of Pennsylvania.

In their study, out of 83 women who had COVID-19 antibodies when they gave birth, 72 of their newborns also had antibodies but no evidence of direct infection. "It is reassuring that maternal infection, whether symptomatic or asymptomatic, results in sufficient antibody production for an efficient transplacental antibody transfer to newborns of infected mothers," said Dr. Flor Munoz of Baylor College of Medicine in an editorial published with the study.

It is possible antibodies created via a vaccine could have the same effect, Munoz noted. Transfer of substances in the mother's blood to the fetus starts around 17 weeks of gestation, she said, which suggests that "maternal vaccination starting in the early second trimester ... might be optimal to achieve the highest levels of antibodies in the newborn." 

Skin problems can persist after COVID-19

Add bothersome skin conditions to the list of symptoms that can follow infection with the new coronavirus, a new report warns. Between April and October, an international registry established by dermatologists received reports of roughly 1,000 COVID-19 patients with itchy welts, rashes, scaly plaques, or pernio, an inflammation of the fingers and toes upon exposure to cold. In half of the cases, the skin problems lasted more than two weeks.

That was more often true for patients with scaly plaques and pernio. Given that some of the patients had only mild COVID-19, the data suggest that inflammation from the disease may persist even among those who were not seriously ill, researchers said in The Lancet Infectious Diseases.

"Since the onset of the COVID-19 pandemic, appreciation for persistent morbidity beyond the acute phase of disease has increased," they said. "To our knowledge, our data represent the largest dataset to date on persistent skin signs and symptoms of COVID-19."