Julie Appleby

The Trump administration says the new regulations "protect people from being enrolled in Marketplace coverage without their knowledge," among other factors. Policy experts said the changes will impose burdens likely to hamper enrollment.

The Department of Justice’s appeal of a Florida judge’s decision could set the parameters for the CDC’s authority in the next outbreak, and public health experts fear the lower court’s decision effectively closes "off future actions for a disease like this one."

What’s really going on with vaccine effectiveness — and is any of it a surprise?