> We’re now inventing new vaccines from scratch and could plausibly go from nothing to a marketed vaccine in about a year. The fastest vaccine development time

> We’re now inventing new vaccines from scratch and could plausibly go from nothing to a marketed vaccine in about a year. The fastest vaccine development timeline to market in human history was for Ebola. That took 5 years. A Zika vaccine was started in 2015 and still has candidates in phase III trials. Why is everyone so optimistic in this case?