Williams. Good evening. Two very sick americans are about to begin a journey by air to this country. And when they arrive they will become the very first known cases of the ebola virus ever on american soil. World Health Officials warned us today this outbreak is moving faster than the efforts to control it and contain it. Some time on saturday the First American patient will arrive at an air base in georgia and then be taken to Emory University hospital as americans and especially those who travel are watching this outbreak closely. In a moment, the things we all need to know about ebola. First tonight to atlanta, awaiting that arrival, nbcs stephanie gosk. Reporter aid workers Nancy Writebol and dr. Kent brantly fighting for their lives in liberia may soon both be home. One arrives tomorrow and will be rushed here to Emory University hospital in atlanta in this specially equipped isolation room. The reason our facility was chosen for this is because we are only we are one of only four institutions in the United States capable of handling patients of this nature. Reporter the medevac is a tightly controlled process led by the u. S. State department and the cdc. Dr. Brantly and writebol will be flown separately on noncommercial planes like this one. With multiple layers of protection to contain the virus, the gurney will be placed within a secured plastic tent. The patient enclosed in another layer of plastic. And anyone in that part of the plane covered head to toe in hazmat suit and gloves. The flight will land at Dobbins Air Base not far from the hospital. The facility is similar to Nebraska Medical Centers biocontainment unit. Where drills like this are regularly held. The patient is contained at all times. Doctors at emory say its enough protection. I will be one of the individuals who will be coming into direct contact with the patients. I have no concerns about either my personal health or the health of the other Health Care Workers who will be working in that unit. Reporter despite assurances, the arrival is triggering some anger and fear. Like this readers comment in the Atlanta Journal constitution. Its just a bad idea, plain and simple. While just down the road from the hospital we heard confidence. I dont have a problem as long as the cdcs involved. Because i feel like theyll take the right precautions. Reporter it may be the best chance of survival for two aid workers who went to africa to help and now need help themselves. The second patient is expected here early next week and will also be brought here to emory. Doctors say families will be allowed to visit, but theyre not going to be allowed inside the room. Their only access, brian, will be through a glass window. Stephanie gosk starting us off in atlanta. Some of this looks like scenes out of a movie of course. And there are a lot of questions about ebola. Understandably a lot of fear as we just heard. Well, tonight we asked our chief medical correspondent dr. Nancy snyderman for some answers. How contagious is ebola . It requires direct contact with vomit, diarrhea or blood. And when a patient is symptomatic. This is not airborne like influenza. You cant catch this casually. Youre not going to get it by being on an airplane. You cant get it by breathing the air. This is a disease passed from infected person to another person. Another question is about symptoms and how easy this is to diagnose. Symptoms can come on any time between two to 21 days after exposure and includes sudden fever as high as 104 to 105, weakness, sore throat, headache. And the body can then become very ill. Nausea, vomiting, diarrhea and in end stage kidney failure and hemorrhage. Next. Just moments ago hamass military wing said it does not have a live israeli captive and all of its fighters involved in the attack were killed by israeli fire. Brian. Richard engel in gaza city tonight with those drones audible in the background. Also tonight, this imagery from gaza. Its digital photography. It was taken earlier in this conflict, but you dont often get to see this. It shows an Incoming Israeli Air strike, a freezeframe showing it in midair headed for its target right before impact. Just days before the release of a Senate Report on american interrogation techniques after the 9 11 attacks, president obama spoke at length on the issue today in what was perhaps his most candid comment on this, the president said among other things we tortured some folks. We get more tonight from nbcs andrea mitchell. Nbcews, new york. Another break here. When we come back, the surprising admission from a big star this morning on today. And thank you for your bravery. Thank you colonel. Thank you daddy. Military families are uniquely thankful for many things, the legacy of usaa Auto Insurance can be one of them. 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