ProPublica: “Robert F. Kennedy Jr., who founded an antivaccine group and once likened the immunization of children to a holocaust, is transforming a government that long championed the lifesaving benefits of shots into one that spreads doubts about their safety here and abroad.”“Kennedy is also considering changes that could prompt the few companies that make vaccines for American kids to abandon the U.S. market, leaving parents who want the shots unable to get them.”