Sainz Bueno, Jose AntonioCerrillos Gonzalez, LucasAbascal-Saiz, AlejandraRodriguez Gallego, Maria VictoriaLopez Perez, RocioFernandez Alonso, Ana Mariade la Cruz Conty, Maria LuisaAlonso Saiz, RubenMolina Oller, MagdalenaSantamaria Ortiz, AmparoMartinez-Perez, OscarSpanish Obstetric Emergency Grp2025-01-072025-01-072021-07-130301-2115https://hdl.handle.net/10668/24906Objective: To evaluate the influence of ABO and Rh blood groups on morbidity among SARS-CoV-2 infected pregnancies.Design: Prospective observational study.Setting: 78 centers of the Spanish Obstetric Emergency Group.Population: Pregnant women with SARS-CoV-2 tested with polymerase-chain-reaction between 26-February and 5-November 2020. A cohort of 1278 SARS-CoV-2(+) pregnant women was analyzed and a concurrent comparison group of 1453 SARS-COV-2 patients was established.Methods: Data were collected from medical charts. SARS-COV-2(+) was compared with SARS-COV-2(-) for differences in distribution of blood groups. We performed multivariate analysis, controlling for maternal age and ethnicity, to evaluate association of ABO and Rh blood groups with maternal and perinatal outcomes in SARS-CoV-2(+) patients with adjusted odds ratios (aOR) and 95% confidence intervals (CI).Main outcomes measures: Medical morbidity: Symptomatic COVID-19 and medical complications. Obstetric outcomes: caesarean delivery, preterm deliveries, preterm premature rupture of membranes (PPROM), hemorrhagic events, pre-eclampsia, maternal and neonatal mortality, stillbirth.Results: Differences were noted between blood types and Rh for age and ethnicity comparing SARS-CoV-2 (+) and SARS-CoV-2(-) groups (penABO blood groupCoronavirusSARS-CoV-2COVID-19PregnancyDisease susceptibilityMaternal morbidityAgeresearch article34271364open access10.1016/j.ejogrb.2021.07.0081872-7654http://www.ejog.org/article/S0301211521003432/pdf755157800015