Every time a different disease surfaces in the news like MERS, Ebola or Enterovirus D 68, one of the first questions people ask is, “Is there a vaccine for it?”  A new documentary created for NOVA on PBS – Vaccines – Calling the Shots recently outlined the history of vaccines and the possibility of vaccine-preventable diseases returning to the U.S.  It’ll take an hour to watch, but it’s excellent – especially for us public health enthusiasts.