Nationwide, Hispanic or Latina mothers make up nearly half of the coronavirus cases among pregnant women, according to data from the Centers for Disease Control and Prevention collected from Jan. 22 until last week. Among more than 14,100 pregnant women who tested positive for the novel coronavirus and provided information about race and ethnicity, 6,447 were Latina — the largest group by far. In a study in Philadelphia, researchers at the University of Pennsylvania found the rate of virus exposure among Black and Hispanic women to be five times higher than among White and Asian women. Doctors say that, anecdotally, they are seeing this same pattern in the D.C. area. During a conference call about three months ago for local obstetricians, D.C. health officials and representatives from hospitals, it became clear that some clinics serving predominantly Latina populations were seeing some of the highest numbers of infections among pregnant women.