The Centers for Disease Control and Prevention will hold a one-day summit next month to help state and local officials fight the Zika virus.
"This meeting will also provide an opportunity to increase knowledge of best communications practices and identify possible gaps in preparedness and response at the federal, state, and local levels."
At which point, FEMA would step in as well.
Can a disease outbreak become a federal emergency? I dont know but since it's never happened before, it probably wont happen.
The CDC aims "to arm state and local leaders with the necessary knowledge and technical support to have a comprehensive Zika Readiness Action Plan."