With 20 confirmed cases of swine flu in the U.S., administration officials declared a public health emergency on Sunday. Dr. Richard Besser, acting director of the Centers for Disease Control and Prevention, and Homeland Security Secretary Janet Napolitano outlined their plans to keep Americans safe at the White House today. "This is moving fast... As we look for swine flu, we are seeing more cases of swine flu and we expect to see more cases of swine flu," Besser said, noting they view the situation as a marathon, not a sprint. "The government can’t solve this alone, we need everybody to take some responsibility," Napolitano said. In Mexico, where it is believed the outbreak originated, 103 people have died and over 1,000 have been sickened by the virus.