Where in the United States has Zika spread thus far?
There is transmission of Zika within U.S. territories like Puerto Rico and American Samoa, as well as a few cases in Miami, Florida, and in or near Brownsville, Texas. Still, due to factors like the widespread use of window screens and air conditioning, the disease is unlikely to spread as widely and as quickly here as it has in some other parts of the world.
What regions of the United States are most likely to be affected?
The southeastern United States (including much of Texas) is most likely to be affected as this is the primary range of the Aedes aegypti mosquito. However, if the closely related Asian tiger mosquito (Aedes albopictus) also proves to be good at transmitting the virus, it could spread to at least 30 states as far north as Connecticut. Based on the spread of similar mosquito-spread viruses like dengue, experts are expecting most United States outbreaks to be small and largely in the southern area of the country, such as Florida and Texas (the sites of local transmission thus far).
What proactive steps is the U.S. taking?
Congress authorized $1.1 billion for Zika. In addition, the Centers for Disease Control and Prevention (CDC) has developed the diagnostic test for Zika virus, and government researchers are studying better methods of detection and prevention. They are also working with at-risk areas to improve mosquito control efforts.