Ebola virus survivor Dr. Kent Brantly (center) and his wife, Amber (left), walk at a news conference at Emory University Hospital in Atlanta Thursday. Brantly and aid worker Nancy Writebol were discharged from the hospital less than a month after they contracted Ebola while treating patients in Liberia.
Erik S. Lesser/EPA/LANDOV
Police officers guard an entrance to Emory University Hospital after an ambulance arrived transporting an American that was infected with the Ebola virus on Saturday. A specially outfitted plane carrying Dr. Kent Brantly from West Africa transpoted him to a military base in Georgia. Another American with Ebola is expected to join him at the hospital in a few days.
The CDC's director, Tom Frieden, testified before a congressional subcommittee Wednesday regarding a recent anthrax incident and lab safety improvements he is instituting.
Sick with chikungunya, Karla Sepulveda, 5, waits in a public hospital with her grandmother in Boca Chica, Dominican Republic, on May 15. The Caribbean nation has reported more than 100,000 cases this year.
Ezequiel Abiu Lopez/AP
Dr. Lisa Sterman held a Truvada pill at her office in San Francisco in 2012. She prescribed Truvada to patients at high risk for HIV infection even before the Food and Drug Administration approved the medicine explicitly for that purpose.
The Centers for Disease Control and Prevention's PulseNet service monitors clusters of sickness linked to potentially dangerous strains of foodborne pathogens such as E.coli or salmonella.