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FILE - This undated file electron microscope image made available by the National Institute of Allergy and Infectious Diseases - Rocky Mountain Laboratories shows novel coronavirus particles, also known as the MERS virus, colorized in yellow. Four more people have died in Saudi Arabia after contracting an often fatal Middle East respiratory virus as the number of new confirmed infections in the kingdom climbs higher, according to health officials. The Saudi health ministry said in a statement posted online late Wednesday, May 8, 2014 that 18 new confirmed cases of the Middle East Respiratory Syndrome were reported in the capital Riyadh, the western cities of Jiddah, Mecca and Medina, and in the city of Najran, along the border with Yemen.(AP Photo/NIAID/RML/APFile)
FILE - This undated file electron microscope image made available by the National Institute of Allergy and Infectious Diseases - Rocky Mountain Laboratories shows novel coronavirus particles, also known as the MERS virus, colorized in yellow. Four more people have died in Saudi Arabia after contracting an often fatal Middle East respiratory virus as the number of new confirmed infections in the kingdom climbs higher, according to health officials. The Saudi health ministry said in a statement posted online late Wednesday, May 8, 2014 that 18 new confirmed cases of the Middle East Respiratory Syndrome were reported in the capital Riyadh, the western cities of Jiddah, Mecca and Medina, and in the city of Najran, along the border with Yemen.(AP Photo/NIAID/RML/APFile)

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Deadly virus spreads to 3rd U.S. patient

CDC: First case of MERS infection transmitted inside the U.S. CNN's senior medical correspondent Elizabeth Cohen reports.

Deadly virus spreads to 3rd U.S. patient

CDC: First case of MERS infection transmitted inside the U.S. CNN's senior medical correspondent Elizabeth Cohen reports.