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After a woman returned to the US from a Zika-affected area, a single act of intercourse likely transmitted the virus.
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, the first US Zika death was reported and local transmission was announced in St. Barthelemy.
The WHO said though Zika virus has circulated in Africa before, the effect of an importation from the Americas is unclear.
Also today, two new microcephaly studies documented Zika virus in fetal tissue, strengthening a possible link between the two conditions.
Seven outbreak countries are seeing a rise in microcephaly or Guillain-Barre disease.
Also today, the CDC added Jamaica and Tonga to its travel advisory, and an Indian company announced two vaccine candidates.
The CDC adds 8 more destinations to its travel alert, as experts assess the threat.
The spread to more countries comes as Brazil reported 340 more possibly related microcephaly cases.
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CIDRAP - Center for Infectious Disease Research and PolicyOffice of the Vice President for Research, University of Minnesota, Minneapolis, MN
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