By Dr. Liji Thomas, MD Reviewed by Lauren Hardaker Jun 16 2026 A real-world US study finds maternal RSVpreF vaccination may help shield newborns from severe RSV illness during their most vulnerable first months of life. Study: Maternal Respiratory Syncytial Virus Prefusion F Vaccination and Acute Respiratory Illness in Infants . Image Credit: Perfect Angle Images / Shutterstock Respiratory syncytial virus ( RSV ) is a major cause of lower respiratory tract infections and hospitalization in