St. Jude patient Omarion Jordan plays outside with his mother, Kristin Simpson, on Wednesday, April 17, 2019, without the protective clothing he previously had to wear whenever he left isolation. Researchers at St. Jude Children’s Research Hospital have developed a novel treatment using HIV as a vector to deliver re-engineered blood cells that create an immune system for patients like 1-year-old Omarion who are born without one. (Courtesy of St. Jude)