Sharona Diaz: What the Disease Control Department finally told us was scary. This thing - nobody was saying "smallpox" yet - was virulent as 2 parts per million. Direct contact, airborne contagion, too - it was scary. The Governor declared it an emergency and they locked the city down, and we realized what kind of hell we were going to be in for. The National Guard move in, but what were they going to do? They weren't doctors.