Spanish nurse Teresa Romero who contracted Ebola raises her arms after being discharged from the Carlos III hospital in Madrid, November 5, 2014. Romero became the first person to contract Ebola outside of Africa, after helping to treat a Spanish missionary who contracted Ebola in Africa and was repatriated to Spain for treatment but subsequently died. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH) 

Spanish nurse Teresa Romero who contracted Ebola, gets a kiss from her husband Javier Limon during her discharge, at the Carlos III hospital in Madrid November 5, 2014. Romero became the first person to contract Ebola outside of Africa after helping to treat a Spanish missionary who contracted Ebola in Africa and was repatriated to Spain for treatment but subsequently died. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH) SOCIETY) 

Spanish nurse Teresa Romero who contracted Ebola smiles during a news conference at the Carlos III hospital in Madrid after being discharged, November 5, 2014. Romero became the first person to contract Ebola outside of Africa after helping to treat a Spanish missionary who contracted Ebola in Africa and was repatriated to Spain for treatment but subsequently died. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH SOCIETY) 

Resident physician Javier Solana gestures after being discharged from Madrid's Carlos III hospital after health authorities released five more patients who were admitted after having contact with Spanish nurse Teresa Romero who contracted Ebola, in Madrid, October 27, 2014. Romero, 44, was the first person to catch the disease outside West African and has been cleared of the deadly virus but has not yet been discharged. The patients released today have passed the 21-day quarantine needed to rule out the contagion, hospital sources said. REUTERS/Andrea Comas (SPAIN - Tags: SOCIETY DISASTER HEALTH) 

Paciencia Melgar, a Guinean nun who was cleared of Ebola after contracting the disease while on mission in Liberia, arrives for a news conference in Madrid October 20, 2014. Melgar called for a joint international fight against Ebola. REUTERS/Andrea Comas (SPAIN - Tags: DISASTER HEALTH) 

Javier Limon Romero, the husband of Spanish nurse Teresa Romero Ramos who contracted Ebola, leans out his window to see a Spanish air force flyover that was participating in Spain's national day ceremonies from the window of his room at an isolation ward on the fifth floor of Madrid's Carlos III Hospital October 12, 2014. Teresa Romero, 44, the Spanish nurse infected with Ebola was conscious and sitting unaided on Saturday, as three more people joined 12 others hospitalized in Madrid to be monitored for signs of the deadly disease. None of the 15 others still under observation has been diagnosed with Ebola so far, though the Spanish government is under fire for its handling both of Romero's case and the threat of a wider outbreak of the disease. REUTERS/Paul Hanna (SPAIN - Tags: HEALTH DISASTER) 

An unidentified patient leans out of a window at an isolation ward on the sixth floor of Madrid's Carlos III Hospital October 12, 2014. Teresa Romero, 44, the Spanish nurse infected with Ebola was conscious and sitting unaided on Saturday, as three more people joined 12 others hospitalized in Madrid to be monitored for signs of the deadly disease. None of the 15 others still under observation has been diagnosed with Ebola so far, though the Spanish government is under fire for its handling both of Romero's case and the threat of a wider outbreak of the disease. REUTERS/Paul Hanna (SPAIN - Tags: HEALTH DISASTER) 

A health worker wearing a protective suit stands near a window at an isolation ward on the sixth floor of Madrid's Carlos III Hospital October 12, 2014. Teresa Romero, 44, the Spanish nurse infected with Ebola was conscious and sitting unaided on Saturday, as three more people joined 12 others hospitalized in Madrid to be monitored for signs of the deadly disease. None of the 15 others still under observation has been diagnosed with Ebola so far, though the Spanish government is under fire for its handling both of Romero's case and the threat of a wider outbreak of the disease. REUTERS/Paul Hanna (SPAIN - Tags: HEALTH DISASTER) 

An unidentified patient waves from her window of an isolation ward on the sixth floor of Madrid's Carlos III Hospital October 12, 2014. Teresa Romero, 44, the Spanish nurse infected with Ebola was conscious and sitting unaided on Saturday, as three more people joined 12 others hospitalized in Madrid to be monitored for signs of the deadly disease. None of the 15 others still under observation has been diagnosed with Ebola so far, though the Spanish government is under fire for its handling both of Romero's case and the threat of a wider outbreak of the disease. REUTERS/Paul Hanna (SPAIN - Tags: HEALTH DISASTER) 

Health workers in protective suits stand near a window at an isolation ward on the sixth floor of Madrid's Carlos III Hospital October 12, 2014. Teresa Romero, 44, the Spanish nurse infected with Ebola was conscious and sitting unaided on Saturday, as three more people joined 12 others hospitalized in Madrid to be monitored for signs of the deadly disease. None of the 15 others still under observation has been diagnosed with Ebola so far, though the Spanish government is under fire for its handling both of Romero's case and the threat of a wider outbreak of the disease. REUTERS/Paul Hanna (SPAIN - Tags: HEALTH DISASTER) 

Health workers in protective suits stand near a window at an isolation ward on the sixth floor of Madrid's Carlos III Hospital October 12, 2014. Teresa Romero, 44, the Spanish nurse infected with Ebola was conscious and sitting unaided on Saturday, as three more people joined 12 others hospitalized in Madrid to be monitored for signs of the deadly disease. None of the 15 others still under observation has been diagnosed with Ebola so far, though the Spanish government is under fire for its handling both of Romero's case and the threat of a wider outbreak of the disease. REUTERS/Paul Hanna (SPAIN - Tags: HEALTH DISASTER) 

An unidentified man gestures as he shows what is believed to be his body temperature (36.1 degree Celsius or 97 degree Fahrenheit) from the window of his room at an isolation ward on the fifth floor at Madrid's Carlos III Hospital, where Spanish nurse Teresa Romero Ramos who contracted Ebola is hospitalized, October 11, 2014. Seven more people were admitted to a specialist isolation unit at the Carlos III hospital on Thursday, taking to 14 the number of people now under observation or being treated there, including Romero's husband. REUTERS/Sergio Perez (SPAIN - Tags: HEALTH DISASTER TPX IMAGES OF THE DAY) 

People protest against the killing of Excalibur, the dog of Spanish nurse Teresa Romero who is the first person to contract Ebola outside of Africa, and the handling of the Ebola crisis, in Madrid October 11, 2014. Health authorities on Thursday put down the dog, a labrador-type breed, who lived with the nurse and her husband in a suburban Madrid flat, saying it posed a biological risk and there was evidence dogs could carry the virus. Sixteen people were being monitored in a Madrid hospital for signs of Ebola on Saturday, with patient numbers rising as the Spanish government tries to contain recriminations over how it has handled the first outbreak of the disease outside Africa. The text on the placards reads, "All with Excalibur" (L) and "All with Teresa". REUTERS/Andrea Comas (SPAIN - Tags: HEALTH DISASTER CIVIL UNREST ANIMALS POLITICS) 

A demonstrator cries during a protest against the killing of Excalibur, the dog of Spanish nurse Teresa Romero who is the first person to contract Ebola outside of Africa, and the handling of the Ebola crisis, in Madrid October 11, 2014. Health authorities on Thursday put down the dog, a labrador-type breed, who lived with the nurse and her husband in a suburban Madrid flat, saying it posed a biological risk and there was evidence dogs could carry the virus. Sixteen people were being monitored in a Madrid hospital for signs of Ebola on Saturday, with patient numbers rising as the Spanish government tries to contain recriminations over how it has handled the first outbreak of the disease outside Africa. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH DISASTER CIVIL UNREST ANIMALS POLITICS) 

Health workers shout and throw gloves at the convoy of Spanish Prime Minister Mariano Rajoy after his visit to Madrid's Carlos III hospital, October 10, 2014. Seven people turned themselves in late on Thursday to an Ebola isolation unit at this hospital in Madrid where Teresa Romero, the nurse who became the first person to contract Ebola outside Africa, lay gravely ill. A hospital spokeswoman said there were now 14 people in the isolation unit on its sealed-off sixth floor, including Romero, her husband, and health workers who had cared for Romero since she was admitted on Monday. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH DISASTER POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

Spanish Prime Minister Mariano Rajoy (C) is flanked by Madrid's regional President Ignacio Gonzalez (L) and Rafael Perez-Santamarina, manager of Madrid's Carlos III hospital, as he gives a statement to the media outside the hospital October 10, 2014. Seven people turned themselves in late on Thursday to an Ebola isolation unit in Madrid where Teresa Romero, the nurse who became the first person to contract Ebola outside Africa, lay gravely ill. REUTERS/Susana Vera (SPAIN - Tags: HEALTH POLITICS) 

Medical workers in protective clothing work in a room on the sixth floor of the Carlos III hospital, where Spanish nurse Teresa Romero Ramos who contracted Ebola is hospitalised, in Madrid, October 10, 2014. Seven people turned themselves in late on Thursday to an Ebola isolation unit in Madrid where Teresa Romero, the nurse who became the first person to contract Ebola outside Africa, lay gravely ill. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH DISASTER TPX IMAGES OF THE DAY) 

Javier Limon Romero, the husband of Spanish nurse Teresa Romero Ramos who contracted Ebola, stretches while looking out of the window of a ward he is being kept isolated in, at Madrid's Carlos III hospital, October 10, 2014. Seven people turned themselves in late on Thursday to an Ebola isolation unit in Madrid where Teresa Romero, the nurse who became the first person to contract Ebola outside Africa, lay gravely ill. A hospital spokeswoman said there were now 14 people in the isolation unit on its sealed-off sixth floor, including Romero, her husband, and health workers who had cared for Romero since she was admitted on Monday. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH DISASTER TPX IMAGES OF THE DAY) 

Javier Limon Romero, the husband of Spanish nurse Teresa Romero Ramos who contracted Ebola, looks out of the window of a ward he is being kept isolated in, at Madrid's Carlos III hospital, October 10, 2014. Seven people turned themselves in late on Thursday to an Ebola isolation unit in Madrid where Teresa Romero, the nurse who became the first person to contract Ebola outside Africa, lay gravely ill. A hospital spokeswoman said there were now 14 people in the isolation unit on its sealed-off sixth floor, including Romero, her husband, and health workers who had cared for Romero since she was admitted on Monday. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH DISASTER TPX IMAGES OF THE DAY) 

Javier Limon, the husband of Spanish nurse Teresa Romero Ramos who contracted Ebola, looks out of the window of a ward he is being kept isolated in, at Madrid's Carlos III hospital, October 9, 2014. The health of Teresa Romero Ramos worsened on Thursday and four other people were put into isolation in Madrid, while the government rejected claims that its methods for dealing with the disease weren't working, and blamed human error. REUTERS/Susana Vera (SPAIN - Tags: HEALTH TPX IMAGES OF THE DAY) 

A woman looks through the window of a ward where she is being kept isolated in as it rains outside at Madrid's Carlos III Hospital October 9, 2014. The health of a Spanish nurse with Ebola worsened on Thursday and four other people were put into isolation in Madrid, while the government rejected claims that its methods for dealing with the disease weren't working, and blamed human error. REUTERS/Susana Vera (SPAIN - Tags: HEALTH) 

An ambulance enters the emergency area at Alcorcon's hospital, outside Madrid, October 9, 2014. The health of a Spanish nurse with Ebola worsened on Thursday and four other people were put into isolation in Madrid, while the country's government rejected claims its methods for dealing with the disease weren't working and blamed human error. REUTERS/Sergio Perez (SPAIN - Tags: HEALTH DISASTER) 

Workers in protective clothing carry a structure out of the apartment building of the nurse who contracted Ebola, in Alcorcon, outside Madrid, October 8, 2014. Spanish health authorities said on Wednesday that another person being monitored in Madrid for Ebola had tested negative for the disease. The man, a Spaniard who had travelled from Nigeria, was one of several people hospitalised after authorities confirmed on Monday that a Spanish nurse had caught the disease in Madrid. REUTERS/Susana Vera (SPAIN - Tags: HEALTH SOCIETY) 

A worker in protective clothing stands outside the entrance of the apartment building of the nurse who contracted Ebola, in Alcorcon, outside Madrid, October 8, 2014. Spanish health authorities said on Wednesday that another person being monitored in Madrid for Ebola had tested negative for the disease. The man, a Spaniard who had travelled from Nigeria, was one of several people hospitalised after authorities confirmed on Monday that a Spanish nurse had caught the disease in Madrid. REUTERS/Susana Vera (SPAIN - Tags: HEALTH SOCIETY) 

An ambulance crew is parked outside the entrance of the apartment building of the nurse who contracted Ebola, in Alcorcon, outside Madrid, October 8, 2014. Spanish health authorities said on Wednesday that another person being monitored in Madrid for Ebola had tested negative for the disease. The man, a Spaniard who had travelled from Nigeria, was one of several people hospitalised after authorities confirmed on Monday that a Spanish nurse had caught the disease in Madrid. REUTERS/Susana Vera (SPAIN - Tags: HEALTH SOCIETY DISASTER) 

Excalibur, the dog of the Spanish nurse who contracted Ebola, barks from her apartment's balcony in Alcorcon, outside Madrid, October 8, 2014. Madrid regional authorities said they would euthanize the nurse's dog Excalibur to avoid possible contagion, sparking an outcry by animal rights activists to save the dog. Spanish health authorities said on Wednesday that another person being monitored in Madrid for Ebola had tested negative for the disease. The man, a Spaniard who had travelled from Nigeria, was one of several people hospitalised after authorities confirmed on Monday that the Spanish nurse had caught the disease in Madrid. REUTERS/Susana Vera (SPAIN - Tags: HEALTH SOCIETY ANIMALS) 

Excalibur, the dog of the Spanish nurse who contracted Ebola, barks from her apartment's balcony in Alcorcon, outside Madrid, October 8, 2014. Madrid regional authorities said they would euthanize the nurse's dog Excalibur to avoid possible contagion, sparking an outcry by animal rights activists to save the dog. Spanish health authorities said on Wednesday that another person being monitored in Madrid for Ebola had tested negative for the disease. The man, a Spaniard who had travelled from Nigeria, was one of several people hospitalised after authorities confirmed on Monday that the Spanish nurse had caught the disease in Madrid. REUTERS/Susana Vera (SPAIN - Tags: HEALTH SOCIETY ANIMALS TPX IMAGES OF THE DAY) 

Spain's Health Minister Ana Mato is surrounded by reporters following a parliamentary session in Madrid, October 8, 2014. Spanish health authorities said on Wednesday that another person being monitored in Madrid for Ebola had tested negative for the disease. The man, a Spaniard who had travelled from Nigeria, was one of several people hospitalised after authorities confirmed on Monday that a Spanish nurse had caught the disease in Madrid. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH SOCIETY DISASTER POLITICS) 

A medical worker in protective gear stands next to a special stretcher carrying a Spanish nurse who was infected by Ebola, outside Alcorcon's hospital, near Madrid, early October 7, 2014. A Spanish nurse has become the first person to contract Ebola outside of Africa, casting doubt over measures taken in Spain to control the potential spread of the deadly disease. REUTERS/Sergio Perez (SPAIN - Tags: HEALTH SOCIETY DISASTER) 

A television cameraman films outside the Carlos III Hospital in Madrid, where a Spanish nurse who contracted Ebola is being treated, October 7, 2014. The Spanish nurse has become the first person to contract Ebola outside of Africa, casting doubt over measures taken in Spain to control the potential spread of the deadly disease. The nurse had helped to treat two priests who contracted Ebola in Africa and were repatriated to Spain. Some 30 other health workers and those who came in contact with her are now being monitored for symptoms. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH SOCIETY DISASTER MEDIA) 

Health workers attend a protest outside La Paz Hospital, calling for Spain's Health Minister Ana Mato to resign after a Spanish nurse contracted Ebola, in Madrid October 7, 2014. Four people, including the nurse who tested for Ebola on Monday, were hospitalised and being monitored over suspicion of potential contagion of the deadly disease, Spain's health authorities said on Tuesday. Officials for Madrid's health system told a news conference those hospitalised included the nurse's husband, a traveller from one affected country and another health worker. They also said the nurse, who did not leave Madrid during her vacations, was currently being treated with drip using antibodies from previous infected patients. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH SOCIETY DISASTER CIVIL UNREST TPX IMAGES OF THE DAY) 

Health workers attend a protest outside La Paz Hospital calling for Spain's Health Minister Ana Mato to resign after a Spanish nurse contracted Ebola, in Madrid, October 7, 2014. Four people, including the nurse who tested for Ebola on Monday, were hospitalised and being monitored over suspicion of potential contagion of the deadly disease, Spain's health authorities said on Tuesday. Officials for Madrid's health system told a news conference those hospitalizsd included the nurse's husband, a traveller from one affected country and another health worker. They also said the nurse, who did not leave Madrid during her vacation, was currently being treated with drip using antibodies from previous infected patients. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH SOCIETY DISASTER POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A doctor walks outside Carlos III hospital in Madrid, where a Spanish nurse who contracted Ebola is being treated, October 7, 2014. Four people, including the nurse who tested for Ebola on Monday, were hospitalised and being monitored over suspicion of potential contagion of the deadly disease, Spain's health authorities said on Tuesday. REUTERS/Andrea Comas (SPAIN - Tags: HEALTH SOCIETY DISASTER) 

Spanish Director General of Public Health Maria Mercedes Vinuesa stands next to a Spanish national flag as she arrives to give a briefing on the person who has contracted Ebola during a health commission at Madrid's parliament October 7, 2014. A Spanish nurse has become the first person to contract Ebola outside of Africa, casting doubt over measures taken in Spain to control the potential spread of the deadly disease. REUTERS/Susana Vera (SPAIN - Tags: HEALTH DISASTER POLITICS) 

Jose Ramon Arribas, Infection Unit Chief at Madrid's La Paz-Carlos III hospital, reacts during a news conference in Madrid October 7, 2014. Four people have been hospitalised in Spain to try to stem the spread of Ebola after a Spanish nurse became the first person in the world known to have contracted the virus outside of Africa, health authorities said on Tuesday. The nurse, who tested positive for the virus on Monday, her husband, who is showing no symptoms of the disease, and two other people are being closely monitored in hospital, health officials told a news conference in Madrid. REUTERS/Susana Vera (SPAIN - Tags: HEALTH SOCIETY DISASTER) 

Spanish Health Minister Ana Mato looks down at the start of a meeting with members of Madrid's regional health office at the Spanish Health Ministry in Madrid October 7, 2014. Four people have been hospitalised in Spain to try to stem the spread of Ebola after the Spanish nurse became the first person in the world known to have contracted the virus outside of Africa, health authorities said on Tuesday. The nurse, who tested positive for the virus on Monday, her husband, who is showing no symptoms of the disease, and two other people are being closely monitored in hospital, health officials told a news conference in Madrid. They also said the nurse, who did not leave Madrid during her vacation, was currently being treated with drip using antibodies from previous infected patients. REUTERS/Susana Vera (SPAIN - Tags: HEALTH SOCIETY DISASTER POLITICS) 

Spanish Health Minister Ana Mato looks down at the start of a meeting with members of Madrid's regional health office at the Spanish Health Ministry in Madrid October 7, 2014. Four people have been hospitalised in Spain to try to stem the spread of Ebola after the Spanish nurse became the first person in the world known to have contracted the virus outside of Africa, health authorities said on Tuesday. The nurse, who tested positive for the virus on Monday, her husband, who is showing no symptoms of the disease, and two other people are being closely monitored in hospital, health officials told a news conference in Madrid. They also said the nurse, who did not leave Madrid during her vacation, was currently being treated with drip using antibodies from previous infected patients. REUTERS/Susana Vera (SPAIN - Tags: HEALTH SOCIETY DISASTER POLITICS) 

A hearse carries the coffin of Spanish priest Miguel Pajares, 75, from Carlos III Hospital in Madrid August 12, 2014. Pajares the first European infected by a strain of Ebola that has killed more than 1,000 people in West Africa, has died in hospital in Madrid, a spokeswoman for the city's health authorities said on Tuesday. REUTERS/Juan Medina(SPAIN - Tags: DISASTER HEALTH) 

A hearse carries the coffin of Spanish priest Miguel Pajares, 75, from Carlos III Hospital in Madrid August 12, 2014. Pajares the first European infected by a strain of Ebola that has killed more than 1,000 people in West Africa, has died in hospital in Madrid, a spokeswoman for the city's health authorities said on Tuesday. REUTERS/Juan Medina(SPAIN - Tags: DISASTER HEALTH)