this is "nightline." >> tonight, deadly virus. >> i remember looking at her. i told her i think i'm going to die. >> the fight for their lives. a too often fatal diagnosis froe ople. now the race to wipe out a rare virus that has no cure. plus, royal footsteps. living hope and living legacy. prince harry and meghan with baby archie in tow embarking on their first trip to africa as a family. the young prince walking in his mother's footsteps, taking on princess diana's mission to clear africa's killing fields, littered with landmines. now the road to a promising future. and -- sweetest surprise. young helpers getting a life

lesson and giving a group hug. but first, the "nightline" 5. . but first, the "nightline" 5. number 1 in just 60 seconds. from the 5am wakers, to the 6am sleepers. everyone uses their phone differently

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with warmer weather stretching into the fall, the stinging season is now extended and concern is spreading over a rare but devastating virus you can get from one little bug bite. >> it was really scary because i couldn't even walk into the emergency room. i had to be like wheeled in. >> reporter: kaylee hardenbrook, once a healthy mother of two young children, was on the verge of death. at first she was stricken with flu-like symptoms. >> i wasn't hungry. i wasn't thirsty. all i wanted to do was sleep. >> reporter: so she went to a hospital. but doctors couldn't figure out what was wrong. >> they sent me home. they said i was just dehydrated. a couple days later i went back to the same hospital. same result. sent me home again. then i had a seizure. my husband had to put me in the car. his sister happened to run the neuro unit at the hospital. i remember looking at her, i told her, "theresa, i think i'm going to die." and then that was the last thing i remembered. >> reporter: kaylee slipped into a coma. meanwhile, doctors worked to

figure out what was making her so sick. they diagnosed her with a rare and deadly mosquito-borne virus called eee, eastern equine encephalitis. there is no cure and no fda-approved vaccine. doctors told her family the outlook was grim. >> i made arrangements for the kids to come in and kind of like say their good-byes. and i'm pretty sure i just fought with everything i could to be here for them. >> reporter: the road to recovery was long and difficult. one month in the hospital. eight weeks of rehab. >> they told me that there was a chance i would never walk again. i'm like, well, that's definitely not going to happen. you don't know me. i have two small boys. i had to learn how to use the >>ow fivs ter eee almost killed same virus is popping up in states across the u.s. >> new game plan against eee. >> it's the worst it's been -- >> it can be potentially deadly. >> reporter: including in kailee's home town of pawpaw, michigan. >> odds of me getting it again

are slim to none but it is terrifying that it's right in your back door. >> it can really strike anyone of any age. >> reporter: the disease has claimed at least nine lives in four states including michigan, rhode island, massachusetts and connecticut. >> this is a serious public health concern. >> reporter: there are reportedly around 30 confirmed or probable cases in seven states. those diagnosed with eee are fighting for their lives. like 5-year-old sophia garabedian. after several weeks in boston children's hospital she's recovered enough to be moved to a rehab facility. communities in affected areas aren't taking any chances. pawpaw school district superintendent rick reo sent home cautionary letters. >> we've gotten information out to our parents regarding safety precautions that they can use to keep their kids safe. >> reporter: they're also hitting the brakes on nighttime football games. >> all of our contests have to be played before dusk. they've tried to get everything done before the sun goes down. the other things that they've done is recommended mosquito

spray and, you know, bug preventative stuff. it's affecting everything around here as far as homecomings and friday night lights. >> it's hard to say which part of the population is more at risk for eee virus. one of thert of the population is outside. is it retired people that are gardening a lot? are the children outside doing activities? >> reporter: in bristol county, massachusetts, 59-year-old laurie sylvia and 78-year-old james longworth both died from eee infections in the past month. >> there really is no steady predictor as to which community this is going to pop out in. even though it's known as an east coast virus there are just as many cases in michigan in the last decade as there had been in massachusetts before this year. >> reporter: in michigan 14-year-old savanah d. hart was hospitalized last month after contracting the virus. her mom says it's been an emotional roller coaster. >> our whole lives have been flipped upside down.

the tears flow just when they flow. they just come out whenever they want at this point. >> reporter: savanah is now in a rehabilitation center, but her mom says she has very extensive brain damage as a result of the virus. >> it's just one day at a time we're taking it with her right now. that's all we can do really. >> i just want to hug her, kiss her, tell her i love her, and i want her to be able to hug me back. >> reporter: symptoms of eee develop four to ten days after being bitten by an infected mosquito. eee cases may vary in severity. some are characterized by chills, fever, muscle and joint pain and usually subside within one to two weeks. other cases have neurological involvement and are far more extreme. >> so infection with eee virus causes flu-like symptoms. it will start with headache, lethargy, fever, and it can progress to neurological symptoms, disorientation, and in severe cases lead to coma and voement are deadly according

to the cdc. many who survive eee are left with permanent neurological damage. but still the disease is very rare. between 2009 and 2018 there were 72 reported cases of neuro-invasive eee in which the virus infects the brain. by comparison during that same time period there were more than 12,000 reported cases of neuro-invasive west nile virus. of those one out of ten died. >> there is a bit of an alarmist quality right now with the media reports given that it is so rare. but it only takes one bite. and with a 40% to 60% fatality this is a real risk that people need to take seriously. >> reporter: over the past month massachusetts has undertaken aerial and ground spraying. >> this is a serious issue for the commonwealth, and we will c the resources and the time to helping our community partners and to preparing for the future. >> reporter: in framingham,

massachusetts public schools are ncinoutdoor recess until temperatures cool. abt that. the first hard frost can't come soon enough frankly. >> reporter: people in affected areas are encouraged to use bug spray, wear long sleeves, high socks, closed toe shoes and hats. removing trash and standing water can also help. >> we've kind of walked our grounds at our maintenance department and working at eliminating any standing water because that's a breeding ground. some schools, including ours, are looking at doing some spraying around the wet areas around the school district. >> reporter: medical officials say mosquitos may stay active even as temperatures cool. the first hard frost of the season will likely end this year's mosquito worries. >> what did you do today? >> reporter: as for kaylee, she says she's just lucky to be alive. >> my doctors told me pretty much the whole time that i was lucky that i was young and i was healthy. and like i said, i just really

always kept a positive attitude. i mean, if i'm going to go out, i'm going to go out in a way cooler way than a mosquito bite. >> reporter: her biggest priority now is keeping her two children, ages 5 and 8, safe. >> i typically spray them in the morning. recently just because it's been getting so bad. i try not to like be a worrywart. but if you do get it, it's scary. >> whoa. up next, harry, meghan and archie in africa. meeting, greeting, and the prince on a mission. >> well done. i have moderate to severe pnow, there's skyrizi. ♪ things are getting clearer, yeah i feel free ♪ ♪ to bare my skin ♪ yeah that's all me. ♪ nothing and me go hand in hand ♪ ♪ nothing on my skin ♪ that's my new plan. ♪ nothing is everything. keep your skin clearer with skyrizi.

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prince harry, meghan, and baby archie are on their first royal trip as a family in africa. for harry it's also a chance to carry the torch lit by his mother, princess diana, for humanitarian efforts there more than two decades old still resonate today.ll >> reporter: 22 years after princess diana shocked the world by walking through a live minefield in angola her son, prince harry, follows in her footsteps. >> to walk in her footsteps is clearly quite emotional for me. but i think as much as she did then there is still so much to do. >> reporter: his emotional walk alone tells the extraordinary story of this ordinary street and of one son's fight to make sure his mother's legacy is not forgotten. >> to see the transformation that hasak pm an a desatarea into a vibrant community of local

businesses and colleges. >> reporter: princess diana's visit to huambo, angola in 1997 was groundbreaking. she went during a lull in the country's 27-year-long civil war. at the time angola had the highest rate of landmines per square mile anywhere in the world. >> these devices injure innocent victims who might simply be playing or working in the fields. >> reporter: royal reporter robert johnson was there. >> it was a really courageous moment. she was getting criticized by the government. and by doing what she did, and we're still now talking all these years later of her walking through that landmine field. >> reporter: he vividly remembers her charisma and compassion. >> what diana had was a real empathy. she was an incredible lady. it just seems, you know, y d ible reall b "nd a sitting beside a young girl who

had lost her leg. they defined the '90s and became a pivotal point in the fight against landmines. >> i'm trying to highlight a problem that's going on all around the world. >> reporter: diana never saw the impact of her visit. she died in a tragic car crash five months after those photos were taken. right before the ottawa treaty was signed by more than 120 countries, banning landmines around the world. >> we can do this. let's all get together and get behind the idea of angola, sri lanka, cambodia being free of mines by 2025. >> reporter: being here, walking where diana walked, you can really feel the impact that her work had here. you can see two schools built right on the edge of what used to be this minefield. it's amazing. right now we can even hear schoolchildren playing outside. the only memory left from that time is this tree. harry taking a moment of reflection in its shade before pledging to continue his mother's work. >> let's finish what was started.

let us consign these weapons to the history books for good. >> reporter: the halo trust worked with diana. now they work with her son. >> mine clearance makes a visible, tangible difference. by retracing their steps nobody can dispute the difference that mine clearance has made here. >> reporter: for the people living here it's a matter of life or death. we're going to meet up with paola. she's lived here her whole life. she lived here when everything was a minefield. >> hello. >> reporter: two years after diana's visit when paola was a little girl she was walking across a field when she stepped on a landmine and lost her leg. her father and older brother also stepped on landmines.dying injuries. three people in your own family.

while life is still very hard for paola, who will forever be an amputee -- >> hello, hello. >> reporter: -- today she's able to raise four children and work in a market in that same neighborhood that used to be strewn with mines. >> there's about 1,200 remaining minefields in angola. you can see the difference here in huambo that mine clearance has had. let's really get behind it and try to make sure the whole of angola can be mine-free by 2025. >> reporter: in dirico harry saw one up close. he walked protected by a halo trust flak jacket and mask just as his mother one did. even remote detonating a live mine. demonstrating the deadly force of these devices. >> a staggering 60 million people around the world still live in fear and risk of land mines. we cannot rnuracks on them and leave a job half done. >> reporter: halo trust says

they hope these new images will bring fresh attention to the issue, similar to the impact diana had all those years ago. an optimism reflected in the faces of the hundreds of schoolchildren lined up to see harry on his visit. it's an enthusiasm we've seen throughout the royal tour. >> prince harry, meghan, and the little one is arriving. >> reporter: after a summer of tough press -- >> prince harry tonight defending the way his family travels. harry facing harsh criticism for traveling in private jets. >> reporter: with dozens of negative headlines on everything from the duke and duchess's use of private planes to the duchess's request to remain anonymous at a wimbledon match. a lot has been riding on harry, meghan, and baby archie as they embarked on their first official tour as a family of three to africa, a place harry has called his second home. >> the trip does come at a time when they've received a fair bit of criticism over the summer in the media. but actually i think what we've seen here since they arrived is a lot of really positive reports.n cape the stt of theirn

stet ess following their every >> who are you most excited to see? >> meghan. >> reporter: but most significantly, royal watchers around the world were waiting for this moment. a glimpse at little archie. as he made his first public appearance to meet archbishop desmond tutu. archbishop tutu, famous for his anti-apartheid work, bestowed a kiss on archie. the first biracial baby of the british royal family. it's a moment that has become emblematic of the young family who are working to forge their own way and develop their identity as a force for change. for meghan that means female empowerment. >> the rights of women and girls is something that's very close to my heart. i am here with you as a mother, as a wife, as a woman, as a woman of color, and as your sister. >> reporter: and for harry it's conservation. >> there are so many problems and a vast majority of them, not all of them but a vast majority of them, at the root cause of that is what we're doing to the climate. >> reporter: as president of african parks, protecting

africa's wildlife, in malawi harry dedicated land to the queen's conservation canopy, a unique network of conservation projects spanning more than 50 countries. on the ground we saw firsthand what his organization is up against. gean der berg, the head ranger in the meziki nature preserve, took us out on a game ride in south africa. >> having someone like prince harry make conservation and anti-poaching such a platform for himself, does that give you hope? >> yeah, it's cool. the fact that he's doing it gets everyone else excited. >> reporter: their visit drawing the world's attention to an often overlooked part of cape town and to the fact that meghan, an american, is the first woman of color in the royal family. marking a new shift for the monarchy. the young family's hands-on approach is a testament to princess diana's legacy, with a bright focus on the future. for "nightline" i'm maggie rulli in south africa. next, the world-class superheroes making sure no student is left behind.

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finally tonight, the priceless teachable moment. >> surprise! >> third grade student daniel hunt of philadelphia, tennessee walking into a carefully orchestrated surprise. little did he know his classmates and teachers went on a secret shopping spree, buying toys for him after he lost all his belongings in a house fire. and who couldn't always use a big hug? what a show of love. that's "nightline." you can always catch our full episodes on hulu. good night, america.