The race for a Zika vaccine slows -- a setback for efforts to head off future outbreaks
The Zika virus is a flu-like disease that is transmitted by the Aedes aegypti mosquito (AFP Photo/Luis Robayo)

The development of a type of Zika vaccine that authorities had hoped to usher to the market has proven more challenging than some scientists and pharmaceutical companies had expected, people involved in the research have told STAT, posing a setback for efforts to avoid future outbreaks of the disease. Although vaccines typically take years to produce,…