There are currently 31 people in the U.S. who have been diagnosed with the Zika virus, including three pregnant women -- two in Illinois and one in New York.
Those infected are spread across 11 states and Washington, D.C., according to the U.S. Centers for Disease Control and Prevention.
All of those infected contracted the virus outside of the U.S. before returning, according to health officials.
Another woman in Hawaii is believed to have had the Zika virus after her infant was born with the associated birth defect called microcephaly -- characterized by an abnormally small head and brain, which can lead to developmental delays.
The birth defect has been associated with the virus in Brazil, where more than 4,000 children have been diagnosed with the condition.