The CDC says that there are now 3.4 million confirmed Zika cases in the US and more than 100,000 confirmed cases in Brazil, with the death toll at more than 1,000.
But there is no clear pattern to the outbreak.
“There is no common denominator,” said Dr. Michael Pate, the director of the National Center for Emerging and Zoonotic Infectious Diseases at the CDC.
“We are trying to get a sense of where the virus is moving and the kinds of people and how it is spreading.”
The virus is also moving at a faster rate in certain regions.
In Dallas, Texas, the city saw an increase in cases of the virus that has been spreading to the Texas capital since early April.
The city’s mayor has declared a state of emergency and declared the state of Texas a state-wide emergency.
The governor of Texas has also declared a statewide state of “excommunication” in response to the virus.
In New York City, the number of confirmed cases has risen from 9,000 in late April to 14,500 on Sunday.
The New York State Department of Health has declared an emergency in the city.
The agency is working with the city to test more than 40,000 people in order to determine if the virus can spread more widely.
What are the symptoms?
The symptoms are usually mild and generally include fever, chills, headache, rash and muscle aches.
But in some cases, symptoms can become more severe.
“The main symptoms you may notice is mild to moderate headache,” said Pate.
“If you have mild fever, you may not have any symptoms at all.”
Is there a vaccine?
How do I protect myself?
There are no vaccines for the Zika outbreak.
Is it contagious?
“There is not enough evidence to say this is a vaccine-induced event,” said the CDC director.
But the agency says that people who contract the virus are at higher risk of getting other illnesses and developing new complications.
What is the CDC doing about it?
In response to this outbreak, the CDC has increased testing for Zika and is now sending out vaccine kits to hospitals to test for Zika.
The CDC is also sending out more than 30,000 vaccine kits.
Where can I find more information about the Zika epidemic?
Here are some tips to keep yourself safe: Do not drive or do anything that requires you to be physically present in an area where Zika is spreading.
Stay home if you have a fever or have a rash.
Avoid wearing clothing that is long or tight.
Try to wear loose clothing if possible.
Do not use an umbrella or head cover.
Get tested for Zika if you or someone you know has symptoms of the disease.
Are there more people getting the virus?
A small number of people have become infected and are showing symptoms of Zika.
But most people are unlikely to contract the disease themselves.
The virus is not transmitted to pregnant women or to newborns.
Read more about the CDC’s response to Zika here.
Want more stories like this?
Become a USA TODAY subscriber and support our journalism.