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Nurse Barbara Smith, left, and Dr. Bryan Christensen demonstrate the proper way for health care workers to use personal protective equipment when dealing with Ebola during an education session in New York, Tuesday, Oct. 21, 2014. Thousands of participants, mostly health care workers, attended the session to review basic facts about Ebola and updated guidelines for protection against its spread. (AP Photo/Seth Wenig)

Nurse Barbara Smith, left, and Dr. Bryan Christensen demonstrate the proper way for health care workers to use personal protective equipment when dealing with Ebola during an education session in New York, Tuesday, Oct. 21, 2014. (AP Photo/Seth Wenig)

Nurse Barbara Smith, left, and Dr. Bryan Christensen demonstrate the proper way for health care workers to use personal protective equipment when dealing with Ebola during an education session in New York, Tuesday, Oct. 21, 2014. Thousands of participants, mostly health care workers, attended the session to review basic facts about Ebola and updated guidelines for protection against its spread. (AP Photo/Seth Wenig)