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Unknowns about Zika virus continue to frustrate

Public health officials race to find answers, develop a vaccine

zika

GOING VIRAL  Zika virus (shown in this false-color transmission electron micrograph) continues to spread across the Americas, and may be linked to a recent rise in birth defects in Brazil.

Jessica Wilson/Science Source

By Meghan Rosen

- More than 2 years ago

WASHINGTON — As worry about the Zika virus outbreak continues to ratchet up, scientists are scrambling to understand what threats the virus poses and how to stop it from spreading.