A new study suggested that the Zika virus may be more dangerous than scientists originally thought.
The study linked Zika to an auto-immune condition in adults with similar symptoms as mulitple sclerosis.
Researchers said patients reported neurological problems including trouble with motor skills, vision and memory. Zika has already been linked to the fetal brain disorder microcephaly.
"Everything we look at with this virus seems to be a bit scarier than we initially thought," said Dr. Ann Schuchart, principle deputy director of the Centers for Disease Control and Prevention. "So while we absolutely hope we don't see widespread local transmission in the continental US, we absolutely need the states to be ready for that."
Experts also warned that Puerto Rico is on the verge of seeing a rise in cases.
Zika prevention kits are being passed out in US Island territories.
Potential vaccines are in the works, but no timetable has been set yet.
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