Health officials have added three more locations to its travel notices for Zika virus precautions.
The Centers for Disease Control and Prevention put Antigua, Barbuda and Turks and Caicos Islands to its interim travel guidance list.
The list urges visitors to take "enhanced precautions" when it comes to avoiding contact with Zika-carrying mosquitoes.
The CDC said it will continue to issue travel notices as they monitor the virus's spread.
It said mosquitoes that spread the infection are aggressive daytime biters. They can also bite at night.
Right now, there is no vaccine.
The CDC said the best way to avoid the virus is to prevent mosquito bites.
Some people who are infected to not have any symptoms. However, people who do have reported fever, rash, joint pain and red eyes. The sickness is usually mild and can range several days to a week.
The virus is believed to cause birth defects.
While bites seem to be the primary mode of spreading the virus, the CDC said it received reports of it being spread by sexual contact with sick returning travelers.
Until more is known, the CDC urges pregnant women and woman trying to become pregnant to avoid traveling to areas with Zika. If travel is necessary, take precautions to avoid mosquito bites.
For a complete list of Zika travel notices from the CDC, check its website here.
Copyright 2016 WFSB (Meredith Corporation). All rights reserved.