RIO DE JANEIRO — With about 500,000 people expected to visit Brazil for the Olympics here this year, researchers are scrambling to figure how much of a risk the Games might pose in spreading the Zika virus around the world.
Infectious disease specialists are particularly focused on the potential for Zika to spread to the United States. As many as 200,000 Americans are expected to travel to Rio de Janeiro for the Olympics in August. When they return to the Northern Hemisphere and its summer heat, far more mosquitoes will be around to potentially transmit the virus in the United States.