Tracking MERS Virus

Third American tests positive for MERS, may have simply being in same room as infected person.
1:44 | 05/17/14

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Transcript for Tracking MERS Virus
Next we turn to the breaking headline, the new case of mers in the country, the third to test positive in the U.S. Tonight some big questions about how this third patient got it. Were they simply in the same room as another patient. Here is ABC's Reena ninan. Reporter: The search is on tonight, the centers for disease control looking for anyone who may have had contact with an Illinois man now believed to be the first case of mers actually transmitted in the U.S. This new patient came in contact twice with the first U.S. Patient, a healthcare worker who traveled to Saudi Arabia and then flew back to the U.S. Through Chicago. The two business associates met twice in Illinois, shaking hands. The first patient is doing well. What many find so alarming with this latest case, the Illinois patient showed none of the symptoms. Another case of mers or midwest respiratory syndrome, was reported just last week in a 44-year-old Saudi Arabian man visiting Florida. Doctors sent home 20 healthcare workers who had contact with him. He flew from London to Boston, Boston to Atlanta, Atlanta to Orlando. 500 travelers on his U.S. Flight alone. Mers began in the middle east two years ago, first detected in camels. Since then 93 patients have died. That's roughly one-third. Reena ninan, ABC news, New York. I want to bring in ABC news chief health and medical editor, Dr. Richard Besser has been tracking this to worked for years with the CDC. First the transmission here simply in a meeting together? 40 minutes in a meeting and a handshake. I'd focus on the handshake because we know a lot of voyeur russs spread that way.

This transcript has been automatically generated and may not be 100% accurate.

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