Also, Mexican scientists have detected Zika virus in Aedes albopictus mosquitoes for the first time in the Americas, and US officials posted guidance for protecting workers.
Talks are under way to break the stalemate, with a survey showing broad Zika support.
Study says 2.2 billion people live in areas suitable for Zika spread, and over the next year more than 5 million babies will be born in vulnerable parts of the Americas.
In scientific developments, researchers report evidence of Zika virus in the cerebrospinal fluid of 30 Brazilian babies born with microcephaly last fall.
Electrostatic differences in a key protein might explain how Zika virus infects human cells.
Also, a gene sequence analysis reveals more about how the outbreak virus evolved and why it spreads so fast.
Health officials reported sexual transmission of Zika virus involving a gay couple.
A comprehensive peer-reviewed analysis demonstrates the link between the virus and the birth defect.
The first full description of the Rio outbreak reveals that itching is a common feature.
As studies show more neuro problems, US officials urge full Zika funding.
