Top U.S. infectious disease experts are urging Congress to fund their fight against the Zika virus.
The heads of both the Centers for Disease Control and Prevention and the National Institute of Allergy and Infectious Diseases said the effects of Zika appear to be worse than anyone thought.
Those effects include severe birth defects and Guillain-Barre syndrome, which causes paralysis.
President Obama has asked Congress for nearly $2 billion that would fund research, prevention and work on a vaccine.
