A Corpus Christi, TX, hospital said that a mixing error that led to a blood thinner overdose in as many as 17 infants was caused by its pharmacy. Two of the babies have died. The error was unrelated to product labeling or packaging of pediatric heparin, according to a statement by the chief medical officer of Christus Spohn Health System. The mixing error is believed to have occurred July 3, and that heparin batch was first administered in the neonatal intensive care unit July 4.