A health worker stands in the Sambadrome as he sprays insecticide to combat the Aedes aegypti mosquitoes that transmits the Zika virus in Rio de Janeiro, Brazil,, Jan. 26, 2016.
Leo Correa—AP
January 27, 2016 12:49 AM EST

Costa Rica reported its first case of Zika virus infection Tuesday as the mysterious virus spreads across the Americas, and U.S. officials added the U.S. Virgin Islands and the Dominican Republic to a growing list of countries that pregnant women might want to avoid.

That makes 24 countries on the list, and the World Health Organization predicts the virus will eventually end up in virtually every Western Hemisphere country.

U.S. health officials briefed President Barack Obama on what they do and don’t know about the virus and its spread. “The President was briefed on the potential economic and developmental impacts…

Read the rest of the story from our partners at NBC News

Contact us at letters@time.com.

Read More From TIME

Related Stories

EDIT POST