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ST. LOUIS - Right now, the Centers for Disease Control and Prevention is working around the clock to track down anyone who may have come in contact with the two patients in the United States who have the MERS virus.

They're also running tests on more than a dozen other health care staffers in Florida who treated one of the patients. Both of the infected patients are from Saudi Arabia.

Dr. Alexander Garza is the associate dean for public health practice at Saint Louis University, and former chief medical officer for the Department of Homeland Security. He joined First @ 4 Thursday to talk about how much of a public threat MERS is to the United States, and to explain more about the virus itself.

Click the video player above to hear what Garza had to say.

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