Mumbai study: One out of every 500 bottles of voluntary donated blood in Mumbai, screened for HIV and marked safe, can give you AIDS. This shocking revelation, made in a study conducted recently, is likely to pose fresh problems for the State Health Department, already struggling to comply with the Supreme Court's ban on professional blood donors.The study, a joint effort of the Aids Research Control Centre (ARCON), J J Hospital and the Directorate of Health Services, has revealed this.