Triple crown favorite California Chrome. The rags to riches story. The one thing we have learned tonight that could keep the horse off the track. Good evening. Its great to have you with us here on a sunday night. We begin with new details on the new infection. It turns out the patient never knew he was infected with mers. His body fighting it off. If this virus is now invisible for some, authorities want to know, are there others infected . Is the virus changing in nature . Spreading more easily . And this question tonight. Is there any good news in all of this since the patient fought it off without even knowing . Our dr. Richard besser is standing by here. He just spoke with the cdc. But first, Steve Osunsami retracing the path of the latest infection. Reporter tonight, an unidentified illinois businessman is believed to be the first mers infection transmitted in the u. S. He initially tested negative. A second test showed his body fought the disease and won. Health officials who sa
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