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The CDC is weighing a warning specifically for pregnant travelers, and federal experts say other mosquito-borne diseases can complicate diagnoses.
Zika outbreaks are getting high-level attention, and Brazil reports 287 new microcephaly cases.
A CDC expert says US spread will likely be localized but calls for better mosquito control.
Also today, two new microcephaly studies documented Zika virus in fetal tissue, strengthening a possible link between the two conditions.
The WHO's top drug and development official projected the launch of a large vaccine trial is still at least 18 months away, but a test might be available within weeks.
Structure details may yield clues on how Zika damages cells and offer an inside track to drug, vaccine, and test developers.
Study results show the virus crosses the placenta and extensively damages fetal brains, and the outbreak strain in the Americas appears worse than in Africa.
Also, agencies publish guidance on Olympics travel and lab testing, and New York City officials outline their Zika response.
Key findings in the monkey study were protection against later infection and that infections in pregnant animals lasted much longer.
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