Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) – The path into the U.S wasn't a quick and straight one for either confirmed MERS patient. The first took two planes from Saudi Arabia to Chicago, then traveled further into Indiana.
The second took four planes to get from Saudi Arabia to Orlando.
What about all the others on board, and the people they came in contact with during their layovers?
CNN's aviation correspondent René Marsh is working backward ti try and determine how many have been exposed, and where.