Amber Vinson speaks before her release from Emory University Hospital in Atlanta, Georgia October 28, 2014. Vinson, 29, the second of two American nurses who became infected with Ebola while treating a Liberian man who died of the disease in Texas was released from an Atlanta hospital on Tuesday having been declared free of the virus. REUTERS/Tami Chappell (UNITED STATES - Tags: HEALTH DISASTER TPX IMAGES OF THE DAY) 

Amber Vinson speaks before her release from Emory University Hospital in Atlanta, Georgia October 28, 2014. Vinson, 29, the second of two American nurses who became infected with Ebola while treating a Liberian man who died of the disease in Texas was released from an Atlanta hospital on Tuesday having been declared free of the virus. REUTERS/Tami Chappell (UNITED STATES - Tags: HEALTH DISASTER) 

Amber Vinson hugs caregivers before her release from Emory University Hospital in Atlanta, Georgia October 28, 2014. Vinson, 29, the second of two American nurses who became infected with Ebola while treating a Liberian man who died of the disease in Texas was released from an Atlanta hospital on Tuesday having been declared free of the virus. REUTERS/Tami Chappell (UNITED STATES - Tags: HEALTH DISASTER) 

Amber Vinson hugs caregivers before her release from Emory University Hospital in Atlanta, Georgia October 28, 2014. Vinson, 29, the second of two American nurses who became infected with Ebola while treating a Liberian man who died of the disease in Texas was released from an Atlanta hospital on Tuesday having been declared free of the virus. REUTERS/Tami Chappell (UNITED STATES - Tags: HEALTH DISASTER) 

The home of Theodore Wilbur, boyfriend of Kaci Hickox, the nurse who was released from New Jersey's mandatory quarantine for certain travelers from Ebola-stricken West Africa, is seen in Fort Kent, Maine, October 28, 2014. Hickox was initially expected to spend the remainder of the 21-day watch period at her boyfriend's house in Fort Kent. REUTERS/Joel Page (UNITED STATES - Tags: HEALTH) 

An "Understanding Ebola" leaflet is pictured on the ground across the street from an apartment building where a child was taken the the hospital to be tested for Ebola in the Bronx borough of New York October 27, 2014. REUTERS/Carlo Allegri (UNITED STATES - Tags: SOCIETY HEALTH) 

U.S. President Barack Obama hugs Dallas nurse Nina Pham at the Oval Office in Washington, October 24, 2014. Obama gave a big hug on Friday to Nina Pham, the Dallas nurse who survived a bout with Ebola.
Obama met Pham in the Oval Office shortly after her release from a nearby hospital after recovering from the virus. Pham, who contracted the disease while treating a man who later died of Ebola in a Dallas hospital, had been undergoing treatment at the National Institutes of Health in Bethesda, Maryland, since Oct. 16. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS HEALTH TPX IMAGES OF THE DAY) 

NYPD officers ask a man wearing personal protective equipment (PPE) as a Halloween costume, to move away from the area near the building where Dr. Craig Spencer lives in New York October 25, 2014. Spencer, 33, who treated Ebola patients in West Africa, was moved with elaborate precautions from his Harlem apartment to Bellevue Hospital in Manhattan with a fever and tested positive for Ebola on Thursday, sparking concern about the spread of the disease in the country's most populous city. REUTERS/Eduardo Munoz (UNITED STATES - Tags: HEALTH SOCIETY) 

An NYPD officer awaits the arrival of Morgan Dixon, fiancee of Dr. Criag Spencer, at the apartment Dixon shares with Spencer in New York, October 25, 2014. Dixon has undergone a medical examination and will now self-quarantine in her apartment for 21 days. Spencer spent a month treating Ebola patients in Guinea with the humanitarian organization Doctors Without Borders, returned to the United States on Oct. 17 and was diagnosed with the virus on Thursday, health officials said. REUTERS/Eduardo Munoz (UNITED STATES - Tags: HEALTH POLITICS) 

Police officers guard the building where Dr. Craig Spencer lives in New York October 23, 2014. Spencer, who worked in West Africa with Ebola patients, tested positive for Ebola and was in isolation at Bellevue Hospital. REUTERS/Eduardo Munoz (UNITED STATES - Tags: HEALTH DISASTER TPX IMAGES OF THE DAY) 

Zuru Pewu holds her four-year-old son Micah inside a home in the Staten Island borough of New York October 23, 2014.
Pewu, 29, who emigrated from Liberia in 2005, and her son Micah recently underwent an experience where they were insulted and linked to the spread of the Ebola virus. Pewu's experience points to an alarming trend. While many Americans have reached out to help, African communities in the U.S. are reporting an increasing number of incidents of ostracism. Picture taken October 23. REUTERS/Shannon Stapleton (UNITED STATES - Tags: HEALTH DISASTER TPX IMAGES OF THE DAY) 

A Liberian flag is seen in the foreground of a sign-in table for "A Staten Island Ebola Summit" held by the African Ebola Crisis Committee at Berta A. Dreyfus Intermediate School 49 in the Staten Island borough of New York October 25, 2014. Despite many different speakers from city agencies and community leadership groups, turnout was less than what organizers had expected. REUTERS/Darren Ornitz (UNITED STATES - Tags: HEALTH POLITICS SOCIETY) 

Dr. Jay Varma, Deputy Commissioner of Health for New York City, gives a news conference after Morgan Dixon (not pictured), fiancee of Dr. Criag Spencer, arrived home in New York, October 25, 2014. Dixon has undergone a medical examination and will now self-quarantine in her apartment for 21 days. Spencer spent a month treating Ebola patients in Guinea with the humanitarian organization Doctors Without Borders, returned to the United States on Oct. 17 and was diagnosed with the virus on Thursday, health officials said. REUTERS/Carlo Allegri (UNITED STATES - Tags: HEALTH POLITICS) 

Participants practise a medical procedure on a dummy arm during training for the Ebola response team at Fort Sam Houston in San Antonio, Texas October 24, 2014. REUTERS/Darren Abate (UNITED STATES - Tags: DISASTER MILITARY HEALTH) 

Maj. Heather Delaney briefs participants during training for the Ebola response team at Fort Sam Houston in San Antonio, Texas October 24, 2014. REUTERS/Darren Abate (UNITED STATES - Tags: DISASTER MILITARY HEALTH) 

A woman pauses as she participates in a march to end Ebola in New York October 24, 2014. New York's West African community organized the march, which commenced in Times Square and headed the United Nations, to call for an end to the disease and highlight xenophobia towards people of West African descent since the disease's outbreak from that region. REUTERS/Andrew Kelly (UNITED STATES - Tags: POLITICS CIVIL UNREST HEALTH DISASTER) 

Chairman of the House Oversight and Government Reform Committee Representative Darrell Issa (D-CA) listens to an aide before the Committee hearing to "examine the federal government's response to the Ebola virus in the U.S. and the effectiveness of interagency coordination to contain the disease" on Capitol Hill in Washington October 24, 2014. REUTERS/Yuri Gripas (UNITED STATES - Tags: POLITICS HEALTH DISASTER) 

Commuters ride an L train for the morning commute a day after an announcement that the subway system had been used by a doctor now testing positive for Ebola in New York October 24, 2014. Craig Spencer, a New York City doctor who treated Ebola patients in West Africa, became the first person to test positive for the virus in America's largest city, setting off fresh fears about the spread of the disease. New York Mayor Bill de Blasio said residents were safe to travel around the city, even as officials disclosed that Spencer had ridden subways, taken a taxi and visited a bowling alley since returning from Guinea on October 17. REUTERS/Lucas Jackson (UNITED STATES - Tags: HEALTH DISASTER TRANSPORT) 

Commuters board an L train for the morning commute a day after an announcement that the subway system had been used by a doctor now testing positive for Ebola in New York October 24, 2014. A New York City doctor who treated Ebola patients in West Africa became the first person to test positive for the virus in America's largest city, setting off fresh fears about the spread of the disease. New York Mayor Bill de Blasio said residents were safe to travel around the city, even as officials disclosed that Dr. Spencer had ridden subways, taken a taxi and visited a bowling alley since returning from Guinea on October 17. REUTERS/Lucas Jackson (UNITED STATES - Tags: HEALTH TRANSPORT) 

New York Mayor Bill de Blasio (table, C) and New York Governor Andrew Cuomo (table, 2nd R) attend a news conference in Bellevue Hospital in New York October 23, 2014. A physician with Doctors Without Borders (MSF) who returned to New York City after treating Ebola victims in West Africa tested positive for the virus, setting off fresh fears about the spread of the disease. Dr. Craig Spencer, 33, is in isolation at Bellevue Hospital. Two friends and his fianc?e have been quarantined. At a news conference, de Blasio sought to reassure the public that they are safe from Ebola. REUTERS/Eduardo Munoz (UNITED STATES - Tags: HEALTH POLITICS TPX IMAGES OF THE DAY) 

New York Mayor Bill de Blasio (2nd L) and New York Governor Andrew Cuomo (2nd R) attend a news conference in Bellevue Hospital in New York October 23, 2014. A physician with Doctors Without Borders (MSF) who returned to New York City after treating Ebola victims in West Africa tested positive for the virus, setting off fresh fears about the spread of the disease. Dr. Craig Spencer, 33, is in isolation at Bellevue Hospital. Two friends and his fianc?e have been quarantined. At a news conference, de Blasio sought to reassure the public that they are safe from Ebola. REUTERS/Eduardo Munoz (UNITED STATES - Tags: HEALTH POLITICS) 

New York Mayor Bill de Blasio (C) and New York Governor Andrew Cuomo (R) attend a news conference in Bellevue Hospital in New York October 23, 2014. A physician with Doctors Without Borders (MSF) who returned to New York City after treating Ebola victims in West Africa tested positive for the virus, setting off fresh fears about the spread of the disease. Dr. Craig Spencer, 33, is in isolation at Bellevue Hospital. Two friends and his fianc?e have been quarantined. At a news conference, de Blasio sought to reassure the public that they are safe from Ebola. REUTERS/Eduardo Munoz (UNITED STATES - Tags: HEALTH POLITICS) 

A woman reads alert on Ebola inside the Bellevue Hospital where Dr. Craig Spencer is being treated for Ebola symptoms in New York October 23, 2014. Spencer, who worked in West Africa with Ebola patients, tested positive for Ebola and is in isolation at the hospital. REUTERS/Eduardo Munoz (UNITED STATES - Tags: HEALTH TPX IMAGES OF THE DAY) 

An exterior view of Bellevue Hospital in New York City, October 23, 2014. A physician with Doctors without Borders (MSF) who returned from West Africa recently and developed potential symptoms is being tested for Ebola at the hospital, health officials said on Thursday, setting off fresh fears about the spread of the virus. REUTERS/Mike Segar (UNITED STATES - Tags: HEALTH DISASTER) 

Members of the New York City Department of Health exit the building of a Health Care worker who is suspected to have Ebola in in the Harlem section of New York, October 23, 2014. The patient being tested for Ebola at a New York City hospital was identified as a doctor named Craig Spencer from Harlem, New York City councilman Mark Levine said on Thursday. REUTERS/Brendan McDermid (UNITED STATES - Tags: HEALTH) 

A member of the New York City Department of Health (R) speaks to neighbors of Dr. Craig Spencer in the Hamilton Heights area of Harlem in New York, October 23, 2014. Spencer, who worked in West Africa with Ebola patients, tested positive for Ebola and was in isolation at Bellevue Hospital. REUTERS/Brendan McDermid (UNITED STATES - Tags: HEALTH DISASTER) 

Bar and bowling venue "The Gutter" stands shuttered a day after a visit by Dr. Craig Spencer, in New York October 23, 2014. Spencer, a physician with Doctors Without Borders who returned to New York City after treating Ebola victims in West Africa tested positive for the virus, setting off fresh fears about the spread of the disease. The New York Times reported that Spencer traveled by subway to a bowling alley in the city's Brooklyn borough on Wednesday night and took a taxi home. The bowling alley, identified by local media as the Gutter, was closed on Thursday. REUTERS/Lucas Jackson (UNITED STATES - Tags: HEALTH DISASTER) 

A man mops the entrance of Dr. Craig Spencer's building while a journalist exits, before it was confirmed he had contracted Ebola, in New York, October 23, 2014. Spencer, a physician with Doctors Without Borders who returned to the city after treating victims in West Africa tested positive for the virus, setting off fresh fears about the spread of the disease. REUTERS/Eduardo Munoz (UNITED STATES - Tags: HEALTH) 

U.S. President Barack Obama holds a meeting with Ebola Response Coordinator Ron Klain (R) and members of his team coordinating the government's Ebola response in the Oval Office of the White House in Washington October 22, 2014. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH) 

Barbara Smith, a registered nurse with Mount Sinai Medical Health Systems, St. Luke's and Roosevelt Hospitals in New York, demonstrates putting on personal protective equipment (PPE) during an Ebola educational session for healthcare workers at the Jacob Javits Convention center in New York, October 21, 2014. Thousands of healthcare workers representing dozens of clinical and non-clinical positions attended the session that featured experts from the Centers for Disease Control and Prevention (CDC) and other area infection control experts to provide training and information on caring for potential Ebola patients. REUTERS/Mike Segar (UNITED STATES - Tags: HEALTH DISASTER) 

A soldier goes through the decontamination process with U.S. Army soldiers from the 101st Airborne Division (Air Assault), who are earmarked for the fight against Ebola, take part in training before their deployment to West Africa, at Fort Campbell, Kentucky October 9, 2014. The U.S. military is ramping up its response to the Ebola outbreak in West Africa, where it has already killed more than 3,400 people in Liberia, Sierra Leone and Guinea. REUTERS/Harrison McClary (UNITED STATES - Tags: HEALTH MILITARY DISASTER TPX IMAGES OF THE DAY) 

Neighboring people watch a man in a hazardous material suit work on cleaning the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 6, 2014. Thomas Eric Duncan, the first person to develop Ebola in the United States, was struggling to survive at a Dallas hospital heightening concerns of the worst Ebola epidemic on record and has killed more than 3,400 people. REUTERS/Jim Young (UNITED STATES - Tags: DISASTER HEALTH SOCIETY) 

U.S. President Barack Obama pauses as he talks next to U.S. Secretary of Health and Human Services Sylvia Burwell (L) and Director of the Centers for Disease Control and Prevention Dr. Thomas Frieden (R) after meeting with his team coordinating the government's Ebola response in the Oval Office of the White House in Washington, October 16, 2014. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS HEALTH) 

Centers for Disease Control and Prevention Director Tom Frieden (at table, from L), National Institute of Allergy and Infectious Disease Director Anthony Fauci, Health and Human Services Director for Biomedical Advanced Research and Development Authority Robin Robinson, Food and Drug Administration Assistant Commissioner for Counterterrorism Policy Luciana Borio and Customs and Border Protection's Office of Field Operations Acting Assistant Commisssioner John Wagner testify before a House Energy and Commerce Oversight and Investigations Subcommittee hearing on the U.S. response to the Ebola crisis, in Washington October 16, 2014. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS HEALTH TPX IMAGES OF THE DAY) 

The Carnival Magic cruise ship is seen after reaching port in Galveston, Texas October 19, 2014. The Carnival Magic arrived on Sunday after a week-long trip with a Dallas hospital lab worker on board who spent much of the cruise in isolation after possible exposure to Ebola. REUTERS/Daniel Kramer (UNITED STATES - Tags: HEALTH TRAVEL TPX IMAGES OF THE DAY) 

Protestor Jeff Hulbert of Annapolis, Maryland holds a sign reading Stop the Flights as he demonstrates in favor of a travel ban to stop the spread of the Ebola virus, in front of the White House, October 16, 2014. REUTERS/Jim Bourg 

Students sit on the ground after being cordoned off by police and barrier tape following an Ebola scare at Southwestern College in Chula Vista, California, October 16, 2014. Officials kept students from leaving a section of the school after one of them reported her sister became sick after returning from a trip. The school later released a statement saying the student's family had travelled to the Midwest, and that a nurse had examined the student and found no symptoms resembling Ebola. REUTERS/Mike Blake 

Director of the U.S. Centers for Disease Control and Prevention Tom Frieden listens via video conference as U.S. President Barack Obama holds a meeting with cabinet agencies coordinating the government's Ebola response in the Cabinet Room of the White House in Washington October 15, 2014. Obama cancelled a fund raising trip today to hold the meeting. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH) 

U.S. Representative Billy Long (R-MO) holds up a copy of a magazine with an Ebola headline as public health officials testify before a House Energy and Commerce Oversight and Investigations Subcommittee hearing on the U.S. response to the Ebola crisis, in Washington, October 16, 2014. REUTERS/Jonathan Ernst 

Centers for Disease Control and Prevention Director Tom Frieden departs after testifying before a House Energy and Commerce Oversight and Investigations Subcommittee hearing on the U.S. response to the Ebola crisis, in Washington October 16, 2014. REUTERS/Jonathan Ernst 

A man walks by security personnel at a patient's entrance of the National Institutes of Health in Bethesda, Maryland October 16, 2014. Nina Pham, the first Texas nurse to be diagnosed with Ebola after treating a Liberian man at a Dallas hospital, is being moved to the hospital.

REUTERS/Gary Cameron 

Texas nurse Amber Vinson (L) steps from an ambulance at Emory University Hospital in Atlanta, Georgia October 15, 2014, after being transferred from Texas Presbyterian Hospital. REUTERS/Jerry Jordan 

Members of the emergency response team with Protect Environmental Services unloads plastic barrels to be used to collect contents from Amber Vinson's apartment in Dallas, October 15, 2014. REUTERS/Jaime R. Carrero 

A private security officer checks the ID of a passerby at the Village Apartment complex where Amber Vinson resides in Dallas, October 15, 2014. REUTERS/Jaime R. Carrero 

The apartment building where Nina Pham, the first U.S. health worker to be infected by the Ebola virus resides, is seen in Dallas, October 16, 2014.
REUTERS/Jaime R. Carrero 

A member of the CG Environmental HazMat team disinfects the entrance to the residence of Nina Pham, a health worker at the Texas Health Presbyterian Hospital who has contracted Ebola in Dallas, October 12, 2014. REUTERS/Jaime R. Carrero 

A metal barrel containing contaminated belongings of Nina Pham is seen in front of the health worker's residence in Dallas, October 12, 2014. REUTERS/Jaime R. Carrero 

A worker in a hazardous material suit removes the contents of the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 6, 2014. REUTERS/Jim Young 

Workers in hazardous material suits clean up after removing the contents of the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 6, 2014. REUTERS/Jim Young 

A worker in a hazardous material suit looks out from the apartment unit where a man diagnosed with the Ebola virus was staying in Dallas, Texas, October 5, 2014. REUTERS/Jim Young 

A hand can be seen holding a thermometer at The Ivy Apartments where a man diagnosed with the Ebola virus was staying in Dallas, Texas October 2, 2014. REUTERS/Mike Stone 

A man passes a bag, delivered by the Red Cross and the North Texas Food Bank, in to the apartment unit at The Ivy Apartments complex where a man diagnosed with the Ebola virus was staying in Dallas, October 2, 2014.

REUTERS/Mike Stone