Weeks ago, hardly anyone in the U.S. knew what the Zika virus was. Now the mosquito-borne illness is raising serious fears, especially for pregnant women. Judy Woodruff talks to Dr. Anthony Fauci of the National Institutes of Health about the…

For the first time, an experimental vaccine taken by 20 healthy adults is successfully and safely stimulating an immunity against Ebola. Judy Woodruff talks to Anthony Fauci of the National Institutes of Health on how the vaccine was developed and…