ZIKA virus is set to return to the fore once the mosquito season starts again in the coming months, and it looks like it could spread further and do more damage than we thought. Cases of Zika virus - and the neurological disorders it causes in babies - have been declining across the Americas in recent months, in part because of a drop in mosquito numbers during winter. There is also evidence that people in affected countries are developing immunity to the virus - although this may be short-lived if the virus evolves, or as newly vulnerable people are born or move to affected areas.
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