evidence: The study, published Tuesday in the journal Obstetrics & Gynecology, was the first to examine the impact of Covid-19 vaccines on the placenta, the authors said. [...] Miller and Goldstein examined placentas from 84 vaccinated women and 116 unvaccinated women who gave birth at one hospital in Chicago. In addition to looking for abnormalities, the team also searched for evidence of abnormal blood flow, which had been previously reported in pregnant patients who have tested positive for Covid-19. The authors saw "no increased incidence" of blood flow issues or placental lesions or malformationsin the women who had the vaccine versus those who did not.