The case, which was decided by a 5-2 vote along party lines, is an important challenge to the federal Public Readiness and Emergency Preparedness Act, or PREP, which grants sweeping immunity to health care workers during times of public health emergency.
Families in Vermont and Maine have tried to sue after their 5- and 6-year-old children were vaccinated against their will, but courts there have blocked those attempts, citing protections in the federal act.
