Scientists infect volunteers with Zika in hunt for vaccines, treatments

Researchers in the United States have shown for the first time they can safely and effectively infect human volunteers with Zika virus, a step towards learning more about the disease and developing vaccines and treatments. The study – known as a "controlled human infection model" – has previously been controversial for Zika because of the risks to participants and lack of treatments. But U.S. regulators and the World Health Organization ruled the new model, developed by a team at the Johns Hopkins Bloomberg School of Public Health, was safe and scientifically important.