As the Zika virus continues to spread, the World Health Organization says it's "spreading explosively" in the Americas.
WHO director general Dr. Margaret Chan said during a speech in Geneva, "The level of concern is high, as is the level of uncertainity."
Currently, there's no cure or vaccine for the mosquito-borne disease that's believed to have caused birth defects and killed newborns, prompting countries to urge women not to get pregnant.
However, medical experts say the disease only causes minor symptoms for adults and most children. (Video via Expedia)
Zika began spreading in May and now is in 23 countries. Several U.S. travelers have reportedly gotten the virus after returning from Central America and South America.
On Wednesday, one medical journal warned the spread has "pandemic potential." Part of this potential is from air travel, which can transport sick patients and infected mosquitoes.
This video includes images from Getty Images.