Asia outbreaks prompt question: Is all Zika dangerous?

By Julie Steenhuysen and Amy Sawitta Lefevre CHICAGO/BANGKOK(Reuters) - Zika's rampage last year in Brazil caused an explosion of infections and inflicted a crippling neurological defect on thousands of babies – an effect never seen in a mosquito-borne virus. It also presented a mystery: why had a virus that had been little more than a footnote in the annals of infectious diseases taken such a devastating turn in the Americas? How had Africa and Asia, where Zika had quietly circulated for