Concerns rise about the spread of the Ebola virus

NEW YORK (ABC News) - Dignitaries from across Africa plan to travel to Washington this weekend for President Obama’s African Summit, but three leaders are staying behind to handle the health crisis.

It is the worst Ebola outbreak in history.

More than a thousand cases reported in guinea, Liberia and Sierra Leone; more than 700 people killed.

"If we don't fight it and contain it there, we will be fighting to contain it in other places," said Ken Isaacs, Samaritan’s Purse charity spokesman.

Serious steps are now being taken to keep the deadly virus from spreading doctors - checking passengers at airports before they can board flights leaving affected countries-

One emergency room in Charlotte - closed Wednesday until doctors cleared a patient who had recently returned from West Africa.

So far there have been no reports of the Ebola virus in the United States, but some doctors fear - it could happen.

"I would not be surprised if we see isolated case arrive here. You can have no symptoms for three weeks after you've been infected but those cases would not spread it around the country. We have good hospitals and good infection control," said Dr. Richard Besser, ABC News Chief Medical Editor.

Ebola is not spread through the air only through close contact-
That is the case with two American missionary healthcare workers infected in Liberia, Dr. Kent Brantly and Nancy Writebol.

Both are still there being treated. Their conditions are improving.

"She was trying to recover and still feeling the effects of the virus."

But at least one family here in the U.S. is feeling the heartbreaking effects of the deadly virus- that has no vaccine and no cure.

"I have three girls who will never get to know their father," said Decontee Sawyer, whose husband died of Ebola.

Patrick Sawyer was supposed to travel to Minnesota to visit those daughters next month, but died in Nigeria shortly after contracting Ebola in Liberia.

More efforts to keep Americans safe from Ebola underway the Peace Corps is pulling its 340 volunteers out of the three affected West African countries-

And two of the volunteers- are now quarantined as a precaution after coming in contact with an infected patient.

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