Also today, the CDC added Jamaica and Tonga to its travel advisory, and an Indian company announced two vaccine candidates.
The case also appears to be the first locally acquired Zika infection in the continental US in this outbreak.
Sanofi and NewLink announce efforts to develop Zika vaccines that will springboard off existing technologies.
Today's emergency declaration was tailored to spur coordinated international study into the possible serious complications of the disease.
In other developments, a Zika gene sequencing study found parallels with chikungunya, and experts are gearing up for an Aedes aegypti summit in Brazil.
Also, more vaccine details emerge, including a candidate that might be available for emergency use this year.
The committee will meet Feb 1 to discuss the growing threat and possibly related neurologic complications.
A CDC expert says US spread will likely be localized but calls for better mosquito control.
Zika outbreaks are getting high-level attention, and Brazil reports 287 new microcephaly cases.
The guidance covers testing of newborns, and the Virgin Islands and DR are now on the travel advisory.
