Why bring Ebola patients to the U.S.?

The Ebola virus has killed more than 700 people in Africa and could have catastrophic consequences if allowed to spread, world health officials say. So why would anyone allow infected Americans to come to Atlanta?

The answer, experts say, is because Emory University Hospital is one of the safest places in the world to treat someone with Ebola. There's virtually no chance the virus can spread from the hospital's super-secure isolation unit.

And another thing, they say: medical workers risking their lives overseas deserve the best treatment they can get.

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Dr. Kent Brantly became the first person infected with Ebola to be brought to the United States from Africa. He arrived Saturday at one of the nation's best hospitals. Fellow aid worker Nancy Writebol was expected to arrive in several days. He climbed out dressed head to toe in white protective clothing, and another person in an identical hazardous materials suit held both of his gloved hands as they walked gingerly inside.

"I hope that our understandable fear of the unfamiliar does not trump our compassion when ill Americans return to the U.S. for care," said Dr. Tom Frieden, director of the U.S. Centers for Disease Control and Prevention. His agency received "nasty emails" and at least 100 calls from people questioning why the sick aid workers should be let into the United States.

Despite the calls and messages directed to the CDC, few of those nearest the hospital Saturday seemed concerned.

"I just think it's a blessing that we can help possibly make the infected person's life a little more tolerable," said Ashley Wheeler, who was shopping just down the street on Saturday. "If I were that person I would want my country to help me the best way they could."

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Emory's infectious diseases' unit was created 12 years ago to handle doctors who get sick at the CDC. It is one of about four in the country equipped with everything necessary to test, treat and contain people exposed to very dangerous viruses.

In 2005, it handled patients with SARS, which unlike Ebola can spread when an infected person coughs or sneezes.

In fact, the nature of Ebola -- which is spread by close contact with bodily fluids and blood -- means that any modern hospital using standard, rigorous, infection-control measures should be able to handle it.

Still, Emory won't be taking any chances.

"Nothing comes out of this unit until it is non-infectious," said Dr. Bruce Ribner, who will be treating the patients. "The bottom line is: We have an inordinate amount of safety associated with the care of this patient. And we do not believe that any health care worker, any other patient or any visitor to our facility is in any way at risk of acquiring this infection."

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Ribner also said the patients deserve help.

"They have gone over on a humanitarian mission, they have become infected through medical care and we feel that we have the environment and expertise to safely care for these patients and offer them the maximum opportunity for recovery from these infections," he said Friday.

Amber Brantly was heartened to see her husband climb out of the ambulance that met his plane at Dobbins Air Reserve Base outside Atlanta.

"It was a relief to welcome Kent home today. I spoke with him, and he is glad to be back in the U.S.," she said in a statement. "I am thankful to God for his safe transport and for giving him the strength to walk into the hospital."

Inside the unit, patients are sealed off from anyone who doesn't wear protective gear.

"Negative air pressure" means air flows in, but can't escape until filters scrub any germs from patients. All laboratory testing is conducted within the unit, and workers are highly trained in infection control. Glass walls enable staff outside to safely observe patients, and there's a vestibule where workers suit up before entering. Any gear is safely disposed of or decontaminated.

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Family members will be kept at a distance for now, the doctors said. The unit "has a plate glass window and communication system, so they'll be as close as 1-2 inches from each other," Ribner said.

Dr. Jay Varkey, an infectious disease specialist who will be treating Brantly and Writebol, gave no word Saturday about their condition. Both have been described as critically ill after treating Ebola patients at a missionary hospital in Liberia, one of four West African countries hit by the largest outbreak of the virus in history.

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There is no cure for the virus, which causes hemorrhagic fever that kills as many as 60-80 percent of the people it infects in Africa. There are experimental treatments, but the missionary hospital had only enough for one person, and Brantly insisted that Writebol receive it. His best hope in Africa was a transfusion of blood including antibodies from one of his patients, a 14-year-old boy who survived thanks to the doctor.

There was also only room on the plane for one patient at a time. Writebol will be next, following the same route to Emory in several days.

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Medical Writers Mike Stobbe and Marilynn Marchione reported from New York and Milwaukee. Video journalists Ron Harris and Alex Sanz in Atlanta contributed to this report.