A troop buildup along the ukrainian border. Our reporter on the scene just blocks away from a massive firefight. Lets go outfront. Good evening, everyone, im erin burnett. Out front tonight, cnn learning the identity of a u. S. General shot dead in afghanistan today. The most senior american officer killed in action since the vietnam war. We go to jim sciutto in just a moment. Breaking tonight, the ebola scare in the United States and west africa. Dr. Sanjay gupta outside the atlanta area hospital where a second american with ebola is now being treated. David mckenzie is is at the epicenter of the breakout tonight. The only reporter in sierra leone. First, though, its being called an insider attack. U. S. Army Major GeneralHarold Greene shot and killed in afghanistan today. The gunman believed to be an afghan soldier opened fire at a Training Facility in kabul injuring the general. The taliban has not claimed responsibility but did praise the shooter. The shooter was killed by Security Forces on the scene. Greenes family has been notified. The pentagon says he was a 34year army veteran, a leader in the Training Command in afghanistan. A man dedicating his life to training afghans to take over their own security was murdered by one of them. Lets begin with jim sciutto. How did this happen . This is a high level visit to whats been described as afghanistans west point in effect. Its the Training Center for senior Afghan Military officers, which is a big priority for u. S. And Coalition Forces there. Arguably one of the most secure places in afghanistan. But what this general did not know and others injured was that lurking among the Afghan Soldiers there was one who was going to take his own gun, a russianmade light machine gun and turn it on his American Partners there. Theyve taken a lot of measures to reduce these socalled green on blue attacks when Afghan Soldiers attack Coalition Soldiers and theyve had a lot of success. Those attacks way down since 2012, but obviously the threat not eliminated. Not eliminated and army Major GeneralHarold Greene. We now know the name. We waited throughout the day to get confirmation of that. He was killed today. They needed to notify his family. What can you tell us about this man, a man who has spent more than 30 years with the u. S. Military. Thats right. He was Deputy Commander of whats called the combined security transition command. So this is deeply involved in transitioning Security Control in afghanistan from Coalition Forces, American Forces are withdrawing to Afghan Forces which weve been which u. S. Forces have been dedicated a lot of manhours, a lot of money trained to take over this role. He was essential in this process. As you said, 34year veteran. Prior to this he was involved in reforming how the pentagon buys all of its military equipment. And just before we came to air, erin, a statement was released by the army chief of staff. Heres what he had to say. Our thoughts and prayers are with his family and the families of the soldiers injured today. Eight american soldiers injured as well. It is their service and sacrifice that define us. He goes on to say they will be committed to their mission which when youve traveled with soldiers there even when they lose someone and tough when its a senior commander, they are committed to the mission and they focus on the next step. Jim sciutto, thank you very much. Joining me on the phone is pentagon spokesman rear admiral john kirby. Thank you for taking the time to be with us. These attacks, theyve dropped in frequency, but theyre still happening. How could this have happened . Well, thats what the investigation is going to look at real hard, erin. I dont have all the specific details and circumstances today. It is still a dangerous place, afghanistan, still a combat zone. We work very hard to try to mitigate the threat, the insider threat, specifically and weve done a lot over the last couple of years to do that. You dont hear about as many of these happening as a couple years ago, but difficult to say you can eliminate it altogether. Theres a lot of security precautions taken, Security Force personnel present on this trip, they did respond eventually killing the assail t assailant. But these are afghans who are vetted, trusted, trained by americans, providing security. Theyve killed dozens of coalition troops. I know it may sound like an unfair question because i know the answer, but i think its fair to ask it. You cant guarantee this wont happen again, can you . There are few guarantees in war, erin, no, we cannot guarantee that it will never happen again. But what we can guarantee our afghan partners, troops and certainly americans is that were going to do everything we can to try to get at this threat as much as possible. Were going to do everything we can to mitigate and minimize it and to prevent Something Like this from happening again. Theres an investigation going on. We need to let that play out. We just dont know all the facts right now. Thank you very much, admiral kirby. Again the spokesperson for the pentagon. Now to break this down, our National Security analyst fran townshend, she was the security adviser to george w. Bush. Admiral kirby had to answer the question honestly, they cant guarantee this wont happen again. Yes, the numbers are down. But appalling to so Many Americans that in a war this country is committed to leaving, the president is drawing down troops, you have people still dying. The first general killed in combat since vietnam today in afghanistan. Its extraordinary. Its tragic for the troops he leads, the command he led, and his family, right . So it really is a particularly painful event. I will tell you i think weve got to be careful to not too quickly jump to conclusions. This is somebody wearing an afghan army uniform. Was this, as you suggested, a vetted, trained someone that took a uniform and put it on . Exactly right. Because we know the taliban. Theyre growing in strength, theyre being more aggressive. Theyve praised this attack, theyve not yet taken claim for it. We dont know if this is a representative of the taliban who put on an afghan uniform. We have to wait for the facts. When i was in afghanistan with a sergeant with a family at home, every day going out to train Afghan Forces about. He talked about how he trusted them and believed in the cause he was doing. And so many of them are trying to come and fight for their country and do the right thing, but when these sorts of things happen, it makes you question as an american, why this country is still continuing with this mission as troops are coming out. Fewer and fewer people to defend. What you wouldnt have seen when you visited with that sergeant like you i was in afghanistan in the spring of 2013 with the general, got briefed on the study they did. The study on afghan troops killing american. Killing american trainers. Its extraordinary the steps and personnel and resources they devote to protecting the trainers. So you have watchers who are there. When that sergeants out training, there are people committed to watching him and watching his back while he does the training. And thats how they reduced the numbers dramatically, these sorts of incidents. Is the pulldown of troops going to mean that there are more of these . What it means is, look, we know that the taliban is looking for opportunities to launch more attacks. This is one of the vectors we know theyre very focused on. So that is certainly a risk. Its what makes getting the Security Agreement in place so we dont do it precipitously so important. Fran townsend, thank you very much. Still out front, the second american infected with ebola now on american soil. Many others being tested. Dr. Sanjay gupta is where the doctor is being treated. Could the experimental drug, is it a cure . A special report on exactly what this is. Breaking news out of ukraine, a russian troop buildup surging along the border. Nak payton walsh is there with a fire fight going on just behind him. Another junshot ive just heard. You can hear that in the distance. From 2000 to 2011, on average 17 manufacturers a day shut down in america. Theres no reason we cant manufacture in the United States. Here at timbuk2, we make more than 70,000 custom bags a year, right here in san francisco. We knew we needed to grow internationally, we also knew that it was much more complicated to deal with. I cant imagine having executed what weve executed without having citi side by side with us. Their global expertise was critical to our International Expansion into asia, into europe and into canada. 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Let me in mmmm let me sit in the car mmmm dont touch my dart the second american aid worker diagnosed with ebola now being treated in the United States. A specially equipped plane carrying nancy wrightbol just arrived outside of atlanta. She was whisked to Emory University hospital to be treated for the lethal virus. Tonight there are fears that the virus may have spread beyond africa. Saudi arabia is now testing a man who fell ill after traveling to sierra lee own. We have more from sierra leone coming up in the center of the hot zone. The only Television Reporter in the world inside sierra leone. First, dr. Sanjay gupta is live out front of Emory University. What have you learned about nancy writebols condition . We heard that she is stable, stable enough to make that trip, that medical evacuation trip from africa to atlanta. We also got a better idea today of just how sick she was a few days ago. I want you to listen to what bruce johnson, the head of s sim usa had to say about her husband. A week ago we were thinking about a possible funeral arrangement arrangements. Yet we kept our faith. Now we have a real reason to be hopeful. One of the thins worth pointing out, he talks about being hopeful. She did receive two doses of this experimental serum that we talked about a bit. Its a type of medication that had been not used before in a human being ever before dr. Kent brantly and then nancy writebol. They sound like they had Pretty Amazing recovery as a result. Well have to see how they do over the next several days. As of now shes in a hospital getting assessed how much of an impact this disease has had on her heart, lungs, kidney and liver. Then hopes to meet with her family as well. It is incredible. We have a special report on this. I know serum isnt necessarily the right word but this potentially miraculous treatment they received. But what precautions is the hospital taking to ensure the safety . These people were in a plane, then transited to an ambulance. You thing about the rik about t were taken. Theres no question, you see the suits people wear who are in closest contact with patients who are sick with ebola. You dont want to get any of the body fluid on any part of your skin because that can potentially cause an infection. Im outside of the hospital. Thats where the Isolation Unit is. Ive been here all day. Its sort of business as isusua. For the vast majority of the Hospital Personnel and the people in this community theres just no risk. You dont feel that at all. The doctors and nurses that go in do have to wear those suits. They have a buddy system to make sure each other is covered adequately. When they walk in there they go in in pairs for that very reason. They take their temperature twice a day as well to see if theres any signs of a viral exposure, but i can tell you dr. Ribner, the lead doctor, he says hell go home every night, hell sleep in his own bed because his concern of being sick is so low, he doesnt worry about going back to his own home. Thank you very much, sanjay gupta. I want to bring in a man who was infected with ebola and survived before they even knew what it was. Thats whats incredible. He was performing an autopsy at the hospital. Well show you now this is whats in now the democratic republic of the congo, in the 70s, it was zaire. He nicked himself with a scal l scalpel. Weeks later he was gravely ill. At first it felt like the flu. For almost two weeks no symptoms, then you felt like you had the flu but much worse. When did you realize what you had was not the flu . And what was it about the symptoms specifically that made you know it was different . You know, the fever was certainly a big part of it. Fever in flu normally doesnt drag on that long. And it carried on my wife made very good temperature charts. This went on for well over a week into two weeks, and that would not be typical for flu. In addition, the rash that i developed, that would not be typical for flu. So we were realizing this is not a classical flu. Theres something more to it than that. Where was the rash. We heard dr. Brantly who now is recovering. They described a rash on his torso. What kind of a rash was it for people trying to understand . So many people are confused and afraid about the symptoms. I dont know if i can tell you in detail because as i told you last night i was pretty much in a stupor. But there was a rash on much of the body. A rash on much of the body. What was the virus doing to your body when you had this rash and this fever that had put you to such an extent and such a high fever that you were in a stupor . The virus is working throughout the entire body. Its attacking cells all throughout. Whether a liver, kidneys, you name it. Its not just the visible like the skin. Its acting in many parts of the body to destroy. Thats what its all about. Thats what causes the i guess at first it could be that youre throwing up, youre vomiting, you have diarrhea, but then just bleeding. Correct. And patients can go into liver failure and renal failure and a major organ failure because of it as well. What were doctors doing . You did not even know you had ebola. Thats correct, yeah. My physician there, my colleague we were the only two doctors at the station at the time. Was using ivs. They were giving me aspirin. Nowadays that seems very strange because we dont normally use aspirin in people that were bleeding. But thats what we had available at the time. But those are the big ones as well as a lot of what i would call spiritual care, prayer for me and this sort of thing. Overall, it was a very difficult time and very little that we could do to cure it. We didnt know what we were dealing with. It was clearly supportive care. It must have been, honestly, dr. Cairns a miracle that you didnt infect your wife, children or anyone else. A man that came in and died and a scalpel that you used to treat him, thats how you got this disease and almost died. They were caring for you not knowing not to get anywhere near any bodily fluids, yet they didnt get it. Thats right. Using that word miracle is exactly the word i would use, too. I cant account for it other than the power of god. Wow, thats an incredible thing to say, and from a doctor. Thank you so much, dr. Cairns. Thank you. The experimental cocktail that could have saved two americans from ebola. It wasnt supposed to be tested on humans until next year at least. And a delicate ceasefire in the middle east. Avo waves dont care what age you are. Take them on the way you always have. Live healthy and take one a day mens 50 . A complete multivitamin with 7 antioxidants to support cell health. Age . Who cares. Then boom. What happened . Stress, fun, bad habits kids, now what . 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Theres still so many questions about the drug that could save two americans from ebola, and obviously the hope would be that it would help save the lives of so many who are in grave danger of losing their lives in africa. Its called zmapp, an experimental medication not approved by the fda. Doctors say when it was given to dr. Kent brantly his condition improved dramatically. When we say dramatically, it is nottage exaggeration. It was an improvement in one hour. Stephanie elam is out front with the money and power of the cocktail. Its profound. Everything we work fo. Repo