this is "nightline." >> tonight, ebola in america. we now know the identity of the man who unwittingly brought this lethal virus here. the race by medical detectives to screen anyone the man came in contact with and the question. did that hospital in texas make a crucial mistake that widened his circle of contact? plus, amy's journey. one year after that fateful tv moment that changed her life forever. >> i have breast cancer. >> "gma's" amy robach sharing her story of survival with co-anchor robin roberts. and a touching pact among friends. how their story is saving lives. and, panda porn? these adorable creatures are endangered, but it's tough to get them to mate in captivity. so, now researchers are

resorting to extremes, you might even say triple extreme, meas e measures. but first, the "nightline" five. when a pro at any 2014 pga tour event sinks a hole in one, quicken loans will pay your mortgage for an entire year. >> that is how it's done. truly amazing. >> get in the hole in one sweepstakes. enter today at pgatour.com/quickenloans. and you could have your mortgage paid for an entire year. >> number one in just 60 seconds.

and good evening. a major american city is on high

alert tonight after the first patient was diagnosed in the u.s. with ebola. doctors are scrambling to find and monitor everybody this patient contacted, including children in his own family. and there are new and urgent questions tonight about why he was initially sent home from the hospital, even after he told a nurse that he had travels from africa's hot zone. abc's cecilia vega is outside that hospital tonight, as we investigate ebola in america. >> reporter: tonight, the city of dallases is on high alert. inside this hospital, a worst fear realized. ebola is in america. >> this is all hands on deck. >> reporter: the patient's name, thomas eric duncan. an african man who traveled to the u.s. from liberia. tonight, in serious condition and under extreme quarantine. a team of cdc detectives streaming into dallas, hoping to keep this contagion completely contained. trying to piece together his moves. as questions swirl about this

local hospital, where the six man was allowed to leave the e.r., even after reporting he'd visited a stricken country in africa. now, a community in fear. >> right here in dallas. and that's terrifying. >> reporter: one of the deadliest viruses on the planet, right in their backyard. we're outside the apartment complex in north dallas where the patient first came right after he arrived in the united states. health officials telling us today that somewhere inside this apartment complex is the man's family right now. they have been told not to leave. there are adults and there are children. while health officials monitor their well being for the next 21 days, no school, no work. they can not leave this building. >> i am scared because there's a lot of children out here and, you know, a lot of us, this is something new to us and it's something scary that i never thought would come here in the united states. >> reporter: it all gbegan on te 19th of september, day one. already infected, but no symptoms, duncan leaves liberia.

at the airport, his temperature probably taken with a thermometer like this. but no fever yet. so, he boards a plane. flying to brussels, hen getting on a united airlines flight full of passengers that flew through dulles. the next day, arriving in dallas. heading to this apartment complex to visit family. including several children. still, no signs of ebola. but four days later, he starts getting sick. and that's when his ebola becomes contagious to others. just over 24 hours later, he's so ill, he walks into this dallas emergency room, telling a nurse he'd travels from west africa. but here, the critical breakdown. that nurse didn't pass the information along and he's sent home. >> a checklist was in place for ebola in this hospital for several weeks. regretfully, that information was not fully communicated throughout the full team. >> reporter: two days later, duncan rushed back to the hospital. this time, by ambulance.

and on tuesday, he tests positive for the ebola virus. the first person ever diagnosed on american soil. today, a race to track down those who have come into contact with the infected man. investigators monitoring up to 18 people from the three emts and doctors and nurses who treated him to family members, including those five children. students at these dallas schools. >> i know that parents are being extremely concerned about that development. but let me assure these children have been identified and they are being monitored. >> reporter: ebola spreads through bodily fluids like sweat and blood. but only those showing symptoms can pass on the virus to others. once infected, the virus can take up to 21 days to start causing symptoms, like fever and vomiting. arepeople are the people of dallas, the people of texas, here in the u.s., are we safe from ebola?

>> i have all confidence in the cdc that we have contained this virus within the number of people that we're looking at now. >> reporter: as of tonight, none of those family members or health care workers who came into close contact with the patient are showing any symptoms. and now the burning question. what went wrong here? and how can we prevent another person from bringing this deadly virus to our shores? dr. richard besser is reporting from the center of the outbreak in liberia. >> reporter: it will happen again. it may not be next week or next month. but as long as ebola runs rampant in west africa, someone else will bring it back to america.besser is at the heart of the battle against ebola. in the same city where the infected man in dallas may have contracted the virus. here, there are more patients than doctors can handle. fears fueling violence and riots. 3,000 people have died in the region. in an attempt to control the

spread, each airline passenger is checked for signs of fever at the pair port. but sick passengers aren't always showing symptoms, which is how one of them made it to america undetected. >> reporter: the passengers on the plane with the infected man were not at risk. you are only contagious after you start to show symptoms. and officials tell us that he developed symptoms several days after he arrived in america. the only people who are truly at risk here are those who came into close contact with him after he became ill. >> reporter: nancy write boll is one of ebola's lucky survivors. an american missionary who was infected in africa, then flown to america for treatment. >> i was running a fever, i had a headache. i was just weak and my muscles ached. >> reporter: she knows what it's like to realize you have the dreaded virus. but she also knolls what it's like to be cured. >> the day that the doctor came in and said, nancy, the tests are turning around, i just

remember saying to the doctor, praise the lord. praise god. and please know to the family and to him that we are praying for him as you walk through this difficult time. >> reporter: a comforting thought tonight for thomas duncan. for "nightline," i'm cecilia vega in dallas. coming up here on "nightline," the on-air moment that altered the course of life forever for our own amy robach. and emotional one-on-one tonight with her friend and mentor, robin roberts. plus, welcome to panda school. can they learn everything they need to know to survive on their own in the wild? literally. you had to go deep into the cupboard. embarrassingly deep. can this mismatched mess be conquered... by a little bit of dish liquid? it can if it's dawn ultra.

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tonight on this first day of breast cancer awareness month, a very personal story from our own amy robach. while on assignment for "good morning america," she learned that she had breast cancer. tonight, what happened next and amy's reflections one year later, as shared with her friend, colleague and fellow cancer survivor, robin roberts. this is part of our breast cancer awareness initiative, abc news goes pink. >> and i started thinking, wow, if i put it off, how many other people have put it off, as well? i went in to see robin who is a breast cancer survivor and she said, you know what, amy? if one life is saved because of early detection, it's all worth it. i'm going to do this so, robin, this one's for you. >> wow. >> i mean, to know what happened now is -- it's emotional to watch that. >> you know, amy, i'm -- wow, i

mean, just to see you and to see you now -- >> talk about live-changing moments happening when up least expect it. >> now to a very, very brave moment. our dear colleague amy robach. she's one of the news staffers having a mammogram. >> this was me, exactly one year ago today. live on abc, about to get my first mammogram. i had been asked if i'd get one on television to demystify it for women who might be nervous. >> it is amy's first. she's sharing that experience with us right now. as it happens. >> so, when abc producers called me last week and asked me to have a mammogram on live national television, my first instinct was -- no way. never going to do it. the truth is, like so many women, busy with work and kids, i had been putting this off for a year. i'm 40 years old. i've never had a mammogram. i've avoided it. little did i know, this would turn out to be one of the best and worst days of my entire life. i'm going to do this.

and so robin, this one's for you. >> amy, no, no, this is for everyone. >> it was for everyone, but it turned out to be for me. the mammogram that changed the course of my life. >> she is so happy right now. i could just see the relief. the relief. >> and that was it. or, so i thought. because a short time later, i was asked to come back for more scans. four weeks later, a tornado of tests. doctors moved quickly when they're concerned. and finally, the diagnosis that turned my world upside down. i had breast cancer. the last year has been the fight of my life. but i have a lot worth fighting for. there have been good days and bad days on this emotional roller coaster. so, with chemo comes hair loss and i'm losing more and more each day. so, today, i am taking control of something that i have very little control of. i'm going to cut my hair very

short. i knew i'd cry at least once. many people have supported mel throughout this journey, but i'll never forget my dear friend and colleague robin who pushed me to take that first crucial step. i thought i was doing something for others who might have cancer. never imagining that i was sitting in this room with two malignant tumors inside of me. you gave me the gift of knowledge, the gift of life and for that,ly be eternally grateful, because you nudged me into that van. >> and so, when you -- when you called me, never in a million years did i think that you would be saying what you said. >> i have breast cancer. >> yeah. how did it surprise you? >> i watched you work through cancer, and i remember thinking, how is she doing that? why is she doing that? i didn't know why. until it happened to me. and then i realized how

important it was to hold onto anything normal. >> we saw you virtually every day. still there, delivering the news for us, being there. what didn't you show us? >> any time i thought about my kids, any time i thought about them worrying about me or me worrying that i'm not going to be there for them. my showers were always my crying time, because the water drowned out the somebodies and when i cried, i cried hard, because it was built up. you put on a brave face. you have to. you want to for all the other women who are out there going through the same thing. you want to show them you can be strong chlgt of cour strong. of course, we're not always that way. >> and another lesson that we're showing people and teaching people, not just the two of us, but the people that surround us every day, and how you can care for a colleague, a friend, who is going through a challenging time. >> and to sit in your chair was such an honor while you were battling your second bout of

cancer. but then, to have you walk me to your chemo chair that you had sat in, seven years prior? to sit in your chair in two completely different ways, but it was so fitting, actually. that was is a surreal thing for me. to see how it all had come fill sus full circle. >> what do you want to get across to people? >> we have to make sure to be vigilant about our own health and giving women that nudge. so, you nudged me, i hope to nudge other women into that mammogram exam room. >> you could have continued to put it off and here we are talking about where we are a year later and i am thankful you are sitting in that chair. to have the information to face it. wouldn't you want to know and be able to have a fighting chance? and there are no guarantees. none whatsoever. but give me a chance. one thing people always ask me, how are you? how are you doing? >> i'm doing great.

and knowledge is power. and so this week, one year from my first mammogram and all that followed -- i'm ready. at least i look the part. i have a special opportunity to surprise other women on a journey i know all too well. >> i am so happy to be here. >> on board delta's breast cancer 1 with 145 women strong. >> i just realized -- i think we're a flight attendant short on today's flight. what's this? "good morning america" anchor and breast cancer survivor, amy robach is here! >> sim excited to be on board the plane with all of you. >> thank you. >> it is their personal stories that inspire me. >> i was really scared. >> i was diagnosed 4 1/2 weeks ago. >> the way we lean on each other and support each other, the way we all let our sisters know that we're not alone. that we're in this together. and we're stronger together.

♪ i want to see you be brave >> we landed in new york city, where the women were greeted by hundreds of supporters. their faces said it all. gat tuesday, grace, hope and joy. ♪ ain't no river wide enough >> i'm looking forward to the day where i won't even think about cancer. i'll just think about living. >> okay, so, just lean over, we'll be side by side at the desk and tell me when you have that day. >> i will. >> because it's going to happen. >> for "nightline" in new york, i'm amy robach. up next here on "nightline," pandas. they're adorable, endangered and very tricky to get to mate in captivity. so, zoo keepers are now resorting to a clever and slightly offcolor tactic. when folks think about what they get from alaska, they think salmon and energy.

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finally tonight, when you're trying to save one of the most beautiful species on earth, sometimes you have to get creative. sometimes, apparently, you have to get a little racy. from our friends at nat geo, tonight, we bring you panda porn. ♪ with those black and white markings and that face, the giant panda is iconic. and endangered. >> 15% of the world population is found in captivity. so, pandas are on the brink of extinction. >> reporter: this team of researchers at the china conservation and research center

for the giant panda have dedicated their lives to restoring the panda population in china. >> as a conservationist, your goal is not just to have a breeding captive population. the ultimate goal is to replenish the wild. and release these animals successfully back into the wild. >> reporter: breeding pandas in captivity is extremely difficult. the female panda is fertile just two days a year. to encourage mating, researchers are using visual still lake. you may call it panda porn. each new generation of pandas is cause for celebration at the research center. these panda cubs will spend the next year in panda kindergarten, learning how to climb trees and act like pandas. researchers recognize that a panda reliant on humans will never be able to survive in the

wild, so, at the panda base, the humans get creative. keepers have to bring in bamboo, so, when they do so, they dress in panda suits. >> the panda suits seem rather comical at first, you know, seeing two giant pandas on walkie-talkies, but they're actually critical to the success of the wild releases for the pandas. the last thing you want to do is produce humans into that natural setting. >> reporter: this panda and his mom have been living undisturbed in the nature reserve for five months. but before researchers will release them into the wild, they have to make sure that they recognize predators. he passes the test and he's ready for his historic release into the wild. the culmination of 30 years of work. >> the fact that we now have this success story brings so

much hope to the future of pandas. not only did he survive and then go through sort of the schooling program of becoming a full-fledged panda, but he was released into the wild. >> best of luck to him. giant pandas, by the way, airs thursday, october 9th on nat geo wild. thank you for watching "nightline" tonight. check out "gma" first thing in the morning and, as always, we're online 24/7 at abcnews.com. good night. [cheers and applause] >> yo! yo! well then. oh! [cheers and applause] hello and welcome to millionaire. i am terry crews. you may know me from brooklyn nine-nine, and i'm thrilled to also be here hosting millionaire.

[cheers and applause] today's first contestant is a horse breeder whose dream it is to win enough money to build her own stable. from lexington, kentucky, please welcome anita nesser! [cheers and applause] hello, anita. how are you? oh, it's so nice to see you. nice to see you. wow. >> hi. >> how do you feel? >> i feel great. >> all right, i'm ready to give you $1 million right now. >> i'm ready to take it. >> all right. [laughs] well, say hello to our millionaire money tree. 14 questions spread over 2 rounds with money values going from 100 bucks all the way up to $1 million. [cheers and applause] now, you know how this works. round 1 has 10 possible questions from that $100 all the way up to $25,000. we have randomly shuffled the questions. we've shuffled up