Detection of spike protein in term placentas of COVID-19 vaccinated and/or SARS-CoV-2 infected women - Catharina Bartmann; Vanessa Schmidt; Michael Mörz; Michael Schwab; Monika Rehn; Bettina Blau-Schneider; Achim Wöckel; Ulrike Kämmerer (PLoS ONE, 2026)