US-POLITICS-OBAMA-EBOLA

US President Barack Obama hugs nurse Nina Pham, who was declared free of the Ebola virus after contracting the disease while caring for a Liberian patient in Texas, during a meeting in the Oval Office of the White House in Washington, DC, October 24, 2014. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-POLITICS-OBAMA-EBOLA

US President Barack Obama hugs nurse Nina Pham, who was declared free of the Ebola virus after contracting the disease while caring for a Liberian patient in Texas, during a meeting in the Oval Office of the White House in Washington, DC, October 24, 2014. (credit: Getty Images)

US President Barack Obama hugs nurse Nina Pham, who was declared free of the Ebola virus after contracting the disease while caring for a Liberian patient in Texas, during a meeting in the Oval Office of the White House in Washington, DC, October 24, 2014. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (L) comes out of the building with Nina Pham (2nd L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, for a news briefing at National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (2nd L) hugs Nina Pham (5th L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, as Pham's mother Diana (R) and sister Cathy (4th L), and Director of the National Institutes of Health Francis Collins (L) look on at the end of a news briefing at National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: (EDITORS NOTE: Re-Transmission of image 457786198 with an alternative crop) Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (2nd L) hugs Nina Pham (3rd L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, as Pham's mother Diana (6th L) and sister Cathy (4th L), and Director of the National Institutes of Health Francis Collins (L) look on at the end of a news briefing at National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (3rd L) leaves with Nina Pham (4th L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, as Director of the National Institutes of Health Francis Collins (L) looks on after a news briefing at National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

US-POLITICS-OBAMA-EBOLA

US President Barack Obama hugs nurse Nina Pham, who was declared free of the Ebola virus after contracting the disease while caring for a Liberian patient in Texas, during a meeting in the Oval Office of the White House in Washington, DC, October 24, 2014. (credit: Getty Images)

US President Barack Obama hugs nurse Nina Pham, who was declared free of the Ebola virus after contracting the disease while caring for a Liberian patient in Texas, during a meeting in the Oval Office of the White House in Washington, DC, October 24, 2014. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Nina Pham (L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, speaks as Director of the National Institutes of Health Francis Collins (2nd L), Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (4th L), Pham's mother Diana (8th L) and sister Cathy (6th L) look on during a news briefing at the National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who was first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (2nd L) comes out of the building with Nina Pham (3rd L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, Pham's mother Diana (5th L) and sister Cathy (7th L), and Director of the National Institutes of Health Francis Collins (L) for a news briefing at the National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who was first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Nina Pham (3rd L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, participates during a news briefing as Pham's mother Diana (4th L) and sister Cathy (2nd L), and Director of NIH Clinical Center John Gallin (L) look on at the National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who was first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (L) hugs Nina Pham (2nd L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, as Director of the National Institutes of Health Francis Collins (R) looks on at the end of a news briefing at the National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who was first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Nina Pham (3rd L), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, is welcomed to the podium by Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (L) as Director of the National Institutes of Health Francis Collins (2nd L) and Director of NIH Clinical Center John Gallin (R) look on during a news briefing at the National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who was first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci (L) and Nina Pham (R), the nurse who was infected with Ebola from treating patient Thomas Eric Duncan, are seen during a news briefing at the National Institutes of Health October 24, 2014 in Bethesda, Maryland. Pham, who was first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

Dallas Nurse Nina Pham Who Contracted Ebola Released From NIH Virus Free

BETHESDA, MD - OCTOBER 24: Director of the National Institute of Allergy and Infectious Diseases Anthony Fauci speaks to members of the media during a news briefing at the National Institutes of Health October 24, 2014 in Bethesda, Maryland. Nina Pham, the nurse who was infected with Ebola from treating patient Thomas Eric Duncan and was first diagnosed on October 12, was declared free of the virus on Friday. (Photo by Alex Wong/Getty Images)

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Nurse Nina Pham

US-POLITICS-OBAMA-EBOLA

US President Barack Obama speaks with nurse Nina Pham, who was declared free of the Ebola virus after contracting the disease while caring for a Liberian patient in Texas, during a meeting in the Oval Office of the White House in Washington, DC, October 24, 2014. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US-POLITICS-OBAMA-EBOLA

US President Barack Obama speaks with nurse Nina Pham, who was declared free of the Ebola virus after contracting the disease while caring for a Liberian patient in Texas, during a meeting in the Oval Office of the White House in Washington, DC, October 24, 2014. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)