Photos:: Ebola in the United States

Barack Obama hugs Dallas nurse Nina Pham, who was declared Ebola free. Pham was the first nurse to be diagnosed with Ebola in the United States.  (Olivier Douliery / EPA)

Dallas-area resident James Faulk displays his Ebola-themed Halloween decorations in University Park, Texas. Faulk has set up a Twitter account and a website in an effort to raise money for Doctors Without Borders.  (Tom Pennington / Getty Images)

United States Postal Service worker Keven Ngo makes a delivery to West 147th Street in New York, while wearing a protective mask. Ngo said that he didn’t typically wear a mask but, since Dr. Craig Spencer was diagnosed with Ebola, he had begun wearing the mask for his protection.   (Bryan Thomas / Getty Images)

New York Gov. Andrew Cuomo, left, speaks as New York Mayor Bill de Blasio listens during a press conference in the governor’s office on the status of Ebola patient Dr. Craig Spencer and New York’s new Ebola policies.  (Jason Szenes / EPA)

People walk past the entrance to Bellvue Hospital in New York City, where a 5-year-old was brought early Oct. 27 after showing Ebola-like symptoms after recently returning from West Africa.  (Andrew Burton / Getty Images)

A mourner cries during a memorial service for Thomas Eric Duncan Oct. 18.  (Nell Redmond / Associated Press)

The Carnival Magic docks at Pier 25 in Galveston, Texas, early Oct. 19. A passenger aboard the cruise ship had been in voluntary isolation in her cabin because of potential contact with the Ebola virus. The woman works as a lab technician at Dallas’ Presbyterian Hospital and may have come into contact with clinical samples belonging to Thomas Eric Duncan, who died after contracting the disease.  (Jennifer Reynolds / Associated Press)

Christine Wade, a registered nurse at the University of Texas Medical Branch, greets Carnival Magic passengers disembarking in Galveston, Texas, Oct. 19. Nurses met passengers with Ebola virus fact sheets and to answer any questions.   (Jennifer Reynolds / Associated Press)

A man in a Hazmat suit cleans the station where a person became sick at a DART train station in Dallas Oct. 18. The person had supposedly been at the same apartment complex as where Ebola victim Thomas Eric Duncan was staying.   (Larry W. Smith / EPA)

Ebola patient Amber Vinson arrives by ambulance at Emory University Hospital in Atlanta on Oct. 15, 2014. She is the second nurse to contract Ebola at Texas Health Presbyterian Hospital while treating patient Thomas Eric Duncan, who died.   (Kevin C. Cox / Getty Images)

The ambulance carrying Ebola patient Amber Vinson arrives at Emory University Hospital in Atlanta. A joint emergency isolation unit administered by the hospital and the CDC has successfully treated two Americans stricken by Ebola.   (David Tulis / Associated Press)

President Obama, joined via teleconference by Dr. Thomas Frieden, director of the Centers for Disease Control and Prevention, speaks to the media during a meeting with members of his team coordinating the government’s response to Ebola cases.   (Jacquelyn Martin / Associated Press)

The Frontier Airlines plane that Amber Vinson took from Cleveland to Dallas on Monday flies out of Cleveland Hopkins International Airport on Wednesday. It was decontaminated twice before it left for Denver without any passengers, said Jacqueline Mayo, an airport spokeswoman.  (Tony Dejak / Associated Press)

A “no trespassing” notice is posted outside the apartment of a healthcare worker who tested positive for Ebola after treating Thomas Eric Duncan, who died from the disease.  (Brandon Wade / Associated Press)

The breach in protocol that allowed Texas nurse Nina Pham (inset) to contract Ebola may have exposed others.  (Associated Press / Getty Images)

A worker cleaning up outside the apartment building of an Ebola-infected hospital worker in Dallas.

A patient at Beth Israel Deaconess Medical Center in Boston does not have Ebola, the hospital concluded Monday.  (Steven Senne / Associated Press)

A hazardous materials worker puts up a plastic sheet before starting to clean the apartment of a hospital worker Sunday.   (LM Otero / Associated Press)

A man dressed in protective clothing leaves after treating the front porch and sidewalk of a Dallas apartment on Sunday where a second person diagnosed with the Ebola virus resides.  (Mike Stone / Getty Images)

Dallas police stand guard at a two-story tan brick apartment building, the home of a healthcare worker who has tested positive for Ebola after caring for an infected Liberian man.  (Molly Hennessy-Fiske / Los Angeles Times)

Media and bystanders look on outside the home of a healthcare worker who tested positive for Ebola in Dallas. The worker had cared for Ebola patient Thomas Eric Duncan.  (Louis DeLuca / Associated Press)

Dr. Daniel Varga of Texas Health Presbyterian Hospital answers questions Sunday about a healthcare worker who contracted Ebola in Dallas.

Johnson Nellon, left, and his brother Thomas Nellon smile at their mother as they arrive from Liberia at John F. Kennedy International Airport.  (Craig Ruttle / Associated Press)

A Dallas County sheriff’s deputy arrives Oct. 8 for treatment at Texas Health Presbyterian Hospital in Dallas. The deputy, who had visited the apartment where Thomas Eric Duncan had been staying, was released after he was found not to have Ebola, officials said.  (Louis DeLuca / Associated Press)

A Dallas hospital sent Liberian national Thomas Eric Duncan home with antibiotics, even though the hospital knew that he had recently arrived from Liberia. Duncan died on Oct. 8.  (Wilmot Chayee / Associated Press)

Ashoka Mukpo is placed into an ambulance Oct. 6 after arriving in Omaha, Neb. The American video journalist, who contracted Ebola while working in Liberia, was taken to Nebraska Medical Center for treatment.   (James R. Burnett / Associated Press)

Nearly 200 airline cabin cleaners walk on a picket line at LaGuardia International Airport. The workers went on strike out of concern over health and safety issues including the possible exposure to the Ebola virus.   (Spencer Platt / Getty Images)