First US Person Diagnosed With MERS Improving (video)

Medical workers leave the hospital's emergency department on April 27, 2014 in the Saudi capital Riyadh. The MERS death toll in Saudi Arabia neared 100 this weekend as the authorities scrambled to reassure an increasingly edgy population in the country worst-hit by the infectious coronavirus. Fayez Nureldine/AFP/Getty Images

Federal, state and local health officials say the condition of the first American diagnosed with a deadly virus from the Middle East is improving.