This undated electron microscope image made availalbe by the National Institute of Allergy and Infections Diseases - Rocky Mountain Laboratories shows novel coronavirus particles, also known as the MERS virus, colorized in yellow. The mysterious new respiratory virus that originated in the Middle East spreads easily between people and appears more deadly than SARS, doctors reported Wednesday, June 19, 2013 after investigating the biggest outbreak in Saudi Arabia. (AP Photo/NIAID - RML)

Associated Press
This undated electron microscope image made availalbe by the National Institute of Allergy and Infections Diseases - Rocky Mountain Laboratories shows novel coronavirus particles, also known as the MERS virus, colorized in yellow. The mysterious new respiratory virus that originated in the Middle East spreads easily between people and appears more deadly than SARS, doctors reported Wednesday, June 19, 2013 after investigating the biggest outbreak in Saudi Arabia. (AP Photo/NIAID - RML)
This undated electron microscope image made availalbe by the National Institute of Allergy and Infections Diseases - Rocky Mountain Laboratories shows novel coronavirus particles, also known as the MERS virus, colorized in yellow. The mysterious new respiratory virus that originated in the Middle East spreads easily between people and appears more deadly than SARS, doctors reported Wednesday, June 19, 2013 after investigating the biggest outbreak in Saudi Arabia. (AP Photo/NIAID - RML)
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