High school senior Emma Burkey received her “one and done” Johnson & Johnson coronavirus vaccine on March 20, and within two weeks was in an induced coma following seizures and clotting in her brain. … the family believes her condition is linked to the vaccine but hasn’t yet been contacted by the company or U.S. health regulators, and that a connection hasn’t been independently confirmed. Burkey’s family can’t look to J&J to cover the medical costs not picked up by her insurance because a 2005 law … shields manufacturers and health-care providers from state and federal liability in instances of public health and bioterrorism emergencies.