Pregnancy Changes Immune Response to Covid Shot, Study Says

Pregnant and breast-feeding women appear to respond relatively weakly to their first dose of Covid-19 vaccines, according to a study that indicates the importance of them receiving both doses of standard regimens.

Immune responses to a single dose of vaccines from Moderna Inc. and Pfizer Inc. and BioNTech SE were weaker than in a group of nonpregnant women, according to the study released Tuesday by Science Translational Medicine. Though all participants developed Covid antibodies against Covid-19, other immune responses, like antibody receptor functions, only reached standard levels after their second dose,

Studies have shown that pregnant women are particularly vulnerable ...