Parvovirus: Conservative management of fetal anemia and hydrops

Following the COVID-19 pandemic, Northwestern Europe has experienced a marked increase in congenital parvovirus infections. This rise is attributed to social distancing measures which disrupted the usual seasonal variation of parvovirus B19. Fetal infection may cause severe anemia, thrombocytopenia, and hydrops fetalis, with significant risk of intrauterine death. Therefore, when acute parvovirus B19 infection is confirmed by maternal serology, serial ultrasound surveillance of the middle cerebral artery peak systolic velocity is recommended. Intrauterine transfusion remains the only established therapeutic option for cases of suspected fetal anemia or hydrops but carries risks of fetal loss and procedural-related complications including fetal hemorrhage and exsanguination. This review critically examines current literature on diagnosis, management, perinatal outcomes, and long-term neurodevelopmental sequelae following congenital parvovirus infection and intrauterine transfusion. Additionally, we report our tertiary fetal medicine center's experience during the 2024 epidemic, highlighting a novel conservative management approach for fetuses with parvovirus-related anemia and hydrops fetalis.