The CDC's director, Tom Frieden, testified before a congressional subcommittee Wednesday regarding a recent anthrax incident and lab safety improvements he is instituting. AFP/Getty Images hide caption

itoggle caption AFP/Getty Images

Particles of H5N1 virus — a particularly dangerous type of bird flu that can infect people — attack lung cells. Chris Bjornberg/Science Source hide caption

itoggle caption Chris Bjornberg/Science Source

The anthrax vaccine has been given to more than 1 million adults in the military. But no one knows how well it would work in children. Randy Davey/Reuters/Landov hide caption

itoggle caption Randy Davey/Reuters/Landov

Students at the University of Washington used a protein-folding program initially funded by the Defense Advanced Research Projects Agency to come up with a treatment for celiac disease. DARPA hide caption

itoggle caption DARPA

Paul Keim at work in his lab on the Northern Arizona University campus.

Charlie McCallie/Northern Arizona University hide caption

itoggle caption Charlie McCallie/Northern Arizona University