Pandemic flu, Ebola, Nipah virus. Emmie de Wit has held all of them in her hands (with three layers of gloves in between, of course).
She's a virologist working at the Rocky Mountain Laboratories in Hamilton, Montana. The 450-person facility, which is part of the National Institutes for Allergy and Infectious Diseases, is nestled in a town of 4,000. It's surrounded by mountains and national forests. Only one road passes through.