Story highlights An ambulance will pick up the patient from a remote part of the airport

A doctor who once had Ebola tests negative for the disease

CDC director to brief President Barack Obama on Monday

Authorities find missing man who is considered at low risk of getting Ebola

A second Ebola patient to be treated at Nebraska Medical Center in Omaha will arrive there early Monday morning, the center said in a statement. The patient is believed to be an American freelance cameraman who worked for NBC.

Ashoka Mukpo was diagnosed with Ebola on Thursday. He left Liberia on a specially-equipped plane Sunday and was headed to Nebraska, the network reported.

Upon arrival, the patient will be immediately taken to a remote part of the airport away from passenger areas, where an ambulance will wait for transport to the hospital.

Increased screening

Screening could soon be increased at U.S. airports because of the Ebola outbreak, officials said Sunday.

Photos: The Ebola epidemic Photos: The Ebola epidemic An Ebola survivor participates in a study in Monrovia, Liberia, on June 17, 2015. The country launched a five-year study to unravel the mystery of the long-term health effects that plague survivors of the viral disease. Since the epidemic started more than a year ago in a remote village in Guinea, more than 11,000 people have died, the vast majority in three West African nations, according to the latest numbers from the World Health Organization . And that number is believed to be low, since there was widespread under-reporting of cases, according to WHO. Hide Caption 1 of 45 Photos: The Ebola epidemic Women in Monrovia celebrate after the World Health Organization declared Liberia Ebola-free on May 9, 2015. Other cases have recurred since, however. Two people in Liberia have died of the disease since the end of June, just weeks after the WHO declared the nation free of the disease. Hide Caption 2 of 45 Photos: The Ebola epidemic A man walks past an Ebola awareness painting in Monrovia on March 22, 2015. Hide Caption 3 of 45 Photos: The Ebola epidemic Soldiers from the U.S. Army's 101st Airborne Division walk across the tarmac at Campbell Army Airfield before reuniting with their families at a homecoming ceremony March 21, 2015 in Fort Campbell, Kentucky. The 162 soldiers were deployed in Liberia, where they helped fight the spread of Ebola. Hide Caption 4 of 45 Photos: The Ebola epidemic Relatives weep for a loved one who it was believed died from Ebola, at a graveyard on the outskirts of Monrovia on March 11, 2015. Hide Caption 5 of 45 Photos: The Ebola epidemic Doctors Without Borders staffer Alex Eilert Paulsen watches as mattresses and bed frames burn at the Ebola Treatment Unit in Paynesville, Liberia, on January 31, 2015. The organization reduced its number of beds from 250 to 30 as gains were made in battling the virus. Hide Caption 6 of 45 Photos: The Ebola epidemic Pauline Cafferkey, a Scottish woman diagnosed with Ebola, is put on a plane in Glasgow, Scotland, on December 30, 2014. Cafferkey, a 39-year-old nurse who volunteered in Sierra Leone, was being transported to London for treatment. Hide Caption 7 of 45 Photos: The Ebola epidemic A child who survived the Ebola virus is fed by another survivor at a treatment center on the outskirts of Freetown, Sierra Leone, on November 11, 2014. Hide Caption 8 of 45 Photos: The Ebola epidemic Health workers in Monrovia cover the body of a man suspected of dying from the Ebola virus on October 31, 2014. Hide Caption 9 of 45 Photos: The Ebola epidemic Kaci Hickox leaves her home in Fort Kent, Maine, to take a bike ride with her boyfriend on October 30, 2014. Hickox, a nurse, recently returned to the United States from West Africa, where she treated Ebola victims. State authorities wanted her to avoid public places for 21 days -- the virus' incubation period. But Hickox, who twice tested negative for Ebola, said she would defy efforts to keep her quarantined at home. Hide Caption 10 of 45 Photos: The Ebola epidemic Health officials in Nairobi, Kenya, prepare to screen passengers arriving at the Jomo Kenyatta International Airport on October 28, 2014. Hide Caption 11 of 45 Photos: The Ebola epidemic U.S. President Barack Obama hugs Ebola survivor Nina Pham in the Oval Office of the White House on October 24, 2014. Pham, one of two Dallas nurses diagnosed with the virus, was declared Ebola-free after being treated at a hospital in Bethesda, Maryland. The other nurse, Amber Vinson (not pictured), was treated in Atlanta and also declared Ebola-free. Hide Caption 12 of 45 Photos: The Ebola epidemic Health workers in Port Loko, Sierra Leone, transport the body of a person who is suspected to have died of Ebola on October 21, 2014. Hide Caption 13 of 45 Photos: The Ebola epidemic Health workers bury a body on the outskirts of Monrovia on October 20, 2014. Hide Caption 14 of 45 Photos: The Ebola epidemic Garteh Korkoryah, center, is comforted during a memorial service for her son, Thomas Eric Duncan, on October 18, 2014, in Salisbury, North Carolina. Duncan, a 42-year-old Liberian citizen, died October 8 in a Dallas hospital. He was in the country to visit his son and his son's mother, and he was the first person in the United States to be diagnosed with Ebola. Hide Caption 15 of 45 Photos: The Ebola epidemic Boys run from blowing dust as a U.S. military aircraft leaves the construction site of an Ebola treatment center in Tubmanburg, Liberia, on October 15, 2014. Hide Caption 16 of 45 Photos: The Ebola epidemic Aid workers from the Liberian Medical Renaissance League stage an Ebola awareness event October 15, 2014, in Monrovia. The group performs street dramas throughout Monrovia to educate the public on Ebola symptoms and how to handle people who are infected with the virus. Hide Caption 17 of 45 Photos: The Ebola epidemic Ebola survivors prepare to leave a Doctors Without Borders treatment center after recovering from the virus in Paynesville, Liberia, on October 12, 2014. Hide Caption 18 of 45 Photos: The Ebola epidemic A man dressed in protective clothing treats the front porch of a Dallas apartment on October 12, 2014. The apartment is home to one of the two nurses who were diagnosed with Ebola after treating Thomas Eric Duncan, a Liberian national who traveled to Dallas and later died from the virus. Hide Caption 19 of 45 Photos: The Ebola epidemic A woman crawls toward the body of her sister as a burial team takes her away for cremation October 10, 2014, in Monrovia. The sister had died from Ebola earlier in the morning while trying to walk to a treatment center, according to her relatives. Hide Caption 20 of 45 Photos: The Ebola epidemic A man digs a grave on October 7, 2014, outside an Ebola treatment center near Gbarnga, Liberia. Hide Caption 21 of 45 Photos: The Ebola epidemic A person peeks out from the Dallas apartment where Thomas Eric Duncan, the first person diagnosed with the Ebola virus in the United States, was staying on October 3, 2014. Hide Caption 22 of 45 Photos: The Ebola epidemic A girl cries as community activists approach her outside her Monrovia home on October 2, 2014, a day after her mother was taken to an Ebola ward. Hide Caption 23 of 45 Photos: The Ebola epidemic A health official uses a thermometer September 29, 2014, to screen a Ukrainian crew member on the deck of a cargo ship at the Apapa port in Lagos, Nigeria. Hide Caption 24 of 45 Photos: The Ebola epidemic Workers move a building into place as part of a new Ebola treatment center in Monrovia on September 28, 2014. Hide Caption 25 of 45 Photos: The Ebola epidemic Medics load an Ebola patient onto a plane at Sierra Leone's Freetown-Lungi International Airport on September 22, 2014. Hide Caption 26 of 45 Photos: The Ebola epidemic A few people are seen in Freetown during a three-day nationwide lockdown on September 21, 2014. In an attempt to curb the spread of the Ebola virus, people in Sierra Leone were told to stay in their homes. Hide Caption 27 of 45 Photos: The Ebola epidemic Supplies wait to be loaded onto an aircraft at New York's John F. Kennedy International Airport on September 20, 2014. It was the largest single shipment of aid to the Ebola zone to date, and it was coordinated by the Clinton Global Initiative and other U.S. aid organizations. Hide Caption 28 of 45 Photos: The Ebola epidemic A child stops on a Monrovia street September 12, 2014, to look at a man who is suspected of suffering from Ebola. Hide Caption 29 of 45 Photos: The Ebola epidemic After an Ebola case was confirmed in Senegal, people load cars with household items as they prepare to cross into Guinea from the border town of Diaobe, Senegal, on September 3, 2014. Hide Caption 30 of 45 Photos: The Ebola epidemic A health worker wearing a protective suit conducts an Ebola prevention drill at the port in Monrovia on August 29, 2014. Hide Caption 31 of 45 Photos: The Ebola epidemic A burial team from the Liberian Ministry of Health unloads bodies of Ebola victims onto a funeral pyre at a crematorium in Marshall, Liberia, on August 22, 2014. Hide Caption 32 of 45 Photos: The Ebola epidemic Dr. Kent Brantly leaves Emory University Hospital on August 21, 2014, after being declared no longer infectious from the Ebola virus. Brantly was one of two American missionaries brought to Emory for treatment of the deadly virus. Hide Caption 33 of 45 Photos: The Ebola epidemic An Ebola Task Force soldier beats a local resident while enforcing a quarantine on the West Point slum on August 20, 2014. Hide Caption 34 of 45 Photos: The Ebola epidemic Local residents gather around a very sick Saah Exco, 10, in a back alley of the West Point slum on August 19, 2014. The boy was one of the patients that was pulled out of a holding center for suspected Ebola patients after the facility was overrun and closed by a mob on August 16. A local clinic then refused to treat Saah, according to residents, because of the danger of infection. Although he was never tested for Ebola, Saah's mother and brother died in the holding center. Hide Caption 35 of 45 Photos: The Ebola epidemic Workers prepare the new Ebola treatment center on August 17, 2014. Hide Caption 36 of 45 Photos: The Ebola epidemic Liberian police depart after firing shots in the air while trying to protect an Ebola burial team in the West Point slum of Monrovia on August 16, 2014. A crowd of several hundred local residents reportedly drove away the burial team and their police escort. The mob then forced open an Ebola isolation ward and took patients out, saying the Ebola epidemic is a hoax. Hide Caption 37 of 45 Photos: The Ebola epidemic A health worker disinfects a corpse after a man died in a classroom being used as an Ebola isolation ward August 15, 2014, in Monrovia. Hide Caption 38 of 45 Photos: The Ebola epidemic Aid worker Nancy Writebol, wearing a protective suit, gets wheeled on a gurney into Emory University Hospital in Atlanta on August 5, 2014. A medical plane flew Writebol from Liberia to the United States after she and her colleague Dr. Kent Brantly were infected with the Ebola virus in the West African country. Hide Caption 39 of 45 Photos: The Ebola epidemic Members of Doctors Without Borders adjust tents in the isolation area in Kailahun on July 20, 2014. Hide Caption 40 of 45 Photos: The Ebola epidemic Boots dry in the Ebola treatment center in Kailahun on July 20, 2014. Hide Caption 41 of 45 Photos: The Ebola epidemic Dr. Jose Rovira of the World Health Organization takes a swab from a suspected Ebola victim in Pendembu, Sierra Leone, on July 18, 2014. Hide Caption 42 of 45 Photos: The Ebola epidemic Red Cross volunteers disinfect each other with chlorine after removing the body of an Ebola victim from a house in Pendembu on July 18, 2014. Hide Caption 43 of 45 Photos: The Ebola epidemic A scientist separates blood cells from plasma cells to isolate any Ebola RNA and test for the virus April 3, 2014, at the European Mobile Laboratory in Gueckedou, Guinea. Hide Caption 44 of 45 Photos: The Ebola epidemic Health specialists work March 31, 2014, at an isolation ward for patients at the facility in southern Guinea. Hide Caption 45 of 45

JUST WATCHED 'Low-risk' Ebola contacts found Replay More Videos ... MUST WATCH 'Low-risk' Ebola contacts found 02:48

JUST WATCHED Doctor: The CDC is lying about Ebola Replay More Videos ... MUST WATCH Doctor: The CDC is lying about Ebola 04:50

JUST WATCHED First rule of covering Ebola: Don't touch Replay More Videos ... MUST WATCH First rule of covering Ebola: Don't touch 10:53

"All options are on the table for further strengthening the screening process here in the U.S., and that includes trying to screen people coming in from Ebola-affected countries with temperature checks," a federal official said.

The source added: "It's not as easy as it sounds. There aren't that many direct flights from Ebola-affected countries to the U.S. anymore. Many passengers are arriving on connecting flights from other parts of the world, and then they come here, so that makes it more of a challenge."

An official with the Centers for Disease Control and Prevention similarly said that enhanced CDC screening at major U.S. airports was under consideration. Any change must be useful enough to warrant the disruption to travelers, that official said.

A separate, senior administration official stressed that enhanced screening is consistent with what Lisa Monaco, President Barack Obama's homeland security and counterterrorism adviser, said last week. However, officials then had argued that such screening could be counterproductive.

Stopping in its tracks

The director of the CDC underscored that authorities are looking into all possibilities, including suggestions from Congress, the public and the media.

"We'll look at those and see what works to protect Americans and to make sure that whatever we do doesn't unintentionally actually increase our risk," Dr. Tom Frieden told reporters.

Earlier, the director told CNN that he is confident there is little risk of an Ebola outbreak in Dallas, where one infected patient is fighting for his life. Frieden is expected to brief Obama on Monday.

He said on "State of the Union" that the CDC is concerned about family members who had "very close contact" with the victim but that they were being monitored constantly.

"That's how you stop it in its tracks. That's why we're confident we won't see a large number of cases from this," he told CNN's Candy Crowley.

Monitoring high and low-risk contacts

JUST WATCHED Media treatment of Ebola going too far? Replay More Videos ... MUST WATCH Media treatment of Ebola going too far? 06:58

JUST WATCHED CDC: Patient takes turn for the worse Replay More Videos ... MUST WATCH CDC: Patient takes turn for the worse 01:14

JUST WATCHED Biosafety expert heads to Liberia Replay More Videos ... MUST WATCH Biosafety expert heads to Liberia 05:25

JUST WATCHED Man falls ill on airliner, CDC responds Replay More Videos ... MUST WATCH Man falls ill on airliner, CDC responds 01:17

Relatives will be monitored for 21 days from their last contact with Thomas Eric Duncan , the only patient to develop Ebola in the United States. If any of them gets a fever, he or she will be isolated, Frieden said.

"That's how we break the chain of transmission, and that's what is going to make sure that we don't have a large outbreak in Dallas or elsewhere in the U.S.," he added.

About 10 people are at "higher risk" of catching Ebola after coming into contact with Duncan but have showed no symptoms, health officials said. That group includes health care workers, who are now on paid leave.

The group is among 50 people being monitored daily, but the other 40 are considered "low risk," Dr. David Lakey, commissioner of the Texas Department of State Health Services, said Saturday.

A homeless man who was on the low-risk list was found Sunday after a nearly day-long search.

After being checked by medical workers and being told to stay where he was, the man left, and authorities began to look for him. He was taken to Parkland Memorial Hospital in Dallas on Sunday, according to the official Twitter account of Sana Syed, a spokeswoman for the city of Dallas.

His temperature was normal, and he was not showing symptoms of Ebola before he disappeared, officials said.

Authorities also found Sunday two other contacts of Duncan's they had previously been unable to locate, a federal official said. The two people, in addition to the homeless man, were in the same ambulance as Duncan on the same day. All three are considered low risk, but authorities want to monitor them for 21 days, said the official.

Critical condition patient

Duncan is in critical condition, a Texas Health Presbyterian Hospital spokeswoman said Saturday.

The Liberian national had previously been listed as being in serious condition. Hospital spokeswoman Candace White offered no new details other than his condition.

Duncan arrived in Dallas on September 20 and started feeling sick days later. He made his initial visit to Texas Health Presbyterian Hospital on September 25.

He was released with antibiotics but went back three days later and was quickly isolated. A blood test Tuesday confirmed that he had Ebola.

Relocated to undisclosed location

"We've been very busy the last 24 hours trying to make sure that everyone who has had potential exposure is identified and they have been evaluated," Lakey said.

The high-risk list probably includes Duncan's partner, Louise, her 13-year-old son and her two 20-something nephews. The four had been holed up in the apartment where Duncan had stayed before he was hospitalized.

They were relocated to an undisclosed place Friday and will be required to stay there until October 19. The incubation period -- the time between Ebola infection and the onset of symptoms -- ranges from two to 21 days.

Louise spoke to CNN's Anderson Cooper on Sunday, telling him that she hasn't felt any symptoms.

"She's very thankful for all the doctors' efforts, but she clearly believes that somehow more could be done," Cooper said Louise said about her partner. Their interview will air Monday night.

The Dallas hospital where Duncan is being treated has come under fire for its handling of his first visit there eight days ago.

Louise, who does not want her last name used, said Duncan told hospital staff that he had a fever and abdominal pain and had recently arrived from Liberia, key information that could have been a tipoff for Ebola.

Health care workers across the nation "have to learn from the experience," Lakey said Saturday.

"The travel history is very important to take, and it has to be communicated," he said.

The hospital defended its handling of the case.

"As a standard part of the nursing process, the patient's travel history was documented and available to the full care team in the electronic health record, including within the physician's workflow," it said in a statement.

The church Louise attends said Duncan came to the United States so the two could get married.

Louise told the church's senior pastor, George Mason, about their marriage plan, according to Mark Wingfield, a spokesman at Wilshire Baptist Church in Dallas.

American doctor tests negative for Ebola

An American patient treated for Ebola in Nebraska, then released, then put in isolation in a hospital in Massachusetts, was removed from isolation on Sunday.

Laboratory tests showed Dr. Richard Sacra does not have Ebola, said Peggy Thrappas, spokeswoman for UMass Memorial Medical Center in Worcester.

Physicians are continuing care for his upper respiratory tract infection, she said.

Sacra went to an emergency room early Saturday in Boston with a cough and fever, according to the missionary organization Serving in Mission. He was afraid he might have pneumonia.

Because of his previous infection, he was transferred and kept in isolation until his test results came back.

"Dr. Sacra came to the hospital with a fever and slight cough. Today, he is in stable condition, his symptoms seem to be improving, and he is eating," lead physician Dr. Robert Finberg said earlier.

Sacra had worked as a medical missionary in Liberia but not directly with Ebola patients. Nevertheless, he contracted the disease. He was treated in isolation at the Nebraska Medical Center in Omaha and then released after testing negative for the virus.

Other Ebola scares

As nervous Dallas residents watch Duncan's case unfold, more Ebola scares have popped up in other parts of the nation.

Howard University Hospital in Washington said Friday that it had admitted a low-risk patient with symptoms that could be associated with Ebola, but health officials said Saturday that Ebola had been ruled out in that case. The unnamed patient had recently traveled to Nigeria.

Liberia, Guinea and Sierra Leone are the three main countries battling the deadly virus.

The CDC remains very concerned about the Ebola outbreak in western Africa, where more than 3,000 people have died. The longer it remains a problem there, the greater the risk for other areas of the world, Frieden said. But battling the disease will be a "long, hard fight," he continued.

"The virus is spreading so fast that it's hard to keep up," the CDC director said.