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This undated file image made available by the CDC shows the Ebola Virus. Hospitals around the country are already getting ample opportunities to test their infection control procedures due to a growing number of Ebola Virus infection false alarms. Across the U.S., one of the nation's largest ambulance companies has put together step-by-step instructions on how to wrap the interior of a rig with plastic sheeting while transporting a patient infected with Ebola. (AP Photo/CDC, File)

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US health providers expand their Ebola precautions

NEW YORK (AP) — Public hospitals in New York City are so concerned about Ebola, they've secretly been sending actors with mock symptoms into emergency rooms to test how well the triage staffs identify and isolate possible cases.