Each morning, teams of army and Health Workers target neighborhoods in the city looking to kill mosquitoes that may carry the zika virus. The epicenter of an explosion of microcephaly, an abnormally small head at birth linked to the infection. Each is a notified case of microcephaly. Reporter the doctor heads up the city health department. Expecting reduce population of mosquito to see less zika and hopefully less microcephaly cases later on. Reporter there are 272,000 homes in this district alone. Officials follow up every two months. 30yearold is pregnant with her fourth child. A worker added chemical to kill mosquito larvae. The breeding of this species of mosquitoes occurs in peoples homes. What are you doing at home to loper your chance of getting bitten by a mosquito. Borgess told me, tries to keep her home clean, eliminates uses bug spray. Still gets mosquito bites once a week. She has had no obvious symptoms of zika, but 80 of the time those infected dont feel sick. What do you worry about . Prejudice exists and is serious. As a mom, i would give all of my love, but i would worry about the outside world. Scott, i asked the Health Commissioner about todays report of sexual transmission of zika virus in the United States the he said that has not been reported yet in brazil, but that after today, Health Officials here are certain to take a closer look. Dr. Jon lapook, reporting for us, jon, thank you. What are the chances of a large outbreak of zika in this country . We put the question to dr. Thomas frieden who runs the centers for disease control. Everything we see so far widespread outbreak of zika in the u. S. We have two things going for us. First, the mosquitoes are not present at all in most of the country. And theyre present in much lower numbers where they are present. Second, because people have air conditioning, are inside, legislation crowded than some of the places where zika is spreading so rapidly, we are much less likely to have the widespread transmission even in the places where are the mosquitoes that spread this virus. Dr. Thomas frieden of the cdc. Turning overseas there was a bang and suddenly a gaping hole in a jetliner over war torn somalia today. Margaret brennan has the that. Reporter cell phone video shot on the plane while still in flight shows oxygen masks fwloeg in the wind near the hole in the airbus 321. Some passenger toward the back of the plane can be seen wearing oxygen masks. On the ground the damage to the plane was clearly visible with out from the body of the plane. All 74 passengers and crew were evacuated. Aviation Officials Say two people were injured. The somali owned airline was on the way from mogadishu to and the diplomat was on the flight and said on facebook he heard a loud noise and couldnt see anything but smoke. After the smoke cleared he realized quite a chunk of the plane was missing. U. S. Intelligence officials are aware of reports there may have been an explosion. It is unclear from structural failure. And a terror group controls part of the country and isis is expanding its footprint. Megan brennan, thank you. Five days ahead of super bowl 50, the nfl is studying how to deal with a 58 increase in concussions. To 182 in 2015. This after the League Already cracked down on helmet to helmet hits. John blackstone is looking into this. After former new york giant tyler sash died at age of 27, doctors were shocked to discover he had a degenerative brain disease, unusually advanced in some one so young. His mother, varnetta, blames football. They could have all the money back if i could have my son back. You know . Nothing else matters. And you cant compensate anybody enough for that. If you continue to deny my work. Reporter in concussion will smith plays the pathologist who first identified the brain disease chronic traumatic encephalopothy or cte. He battled the football establishment to have it nobody is denying cte any longer. The doctor studied the brains of dozens of deceased nfl players. How many of the players on the field, on super bowl sunday, will already be suffering from brain damage . I believe that 90 to 100 of, of professional players will suffer from cte. I think that is a bift hyperbole, honestly. I cant imagine that being the case. Reporter dr. Mitch berger, is chair of the committee that monitors head injuries for the nfl. Over the past decade the league made dozens of rule changes to reduce the risk. An athletic trainer, dubbed eye in the sky watches for injuries from a stadium box and independent Neurological Consultant monitors from the side lines. I think primarily because the of the vigilance, the consultant, spotter in the media box there were twice as many evaluations or screenings for concussions this year. Reporter the doctor believes it takes less than a concussion to damage the brain. By the time you reach a professional level, you must have received thousands, if not not hundreds of thousands of blows to your head. Reporter the doctor has a foundation to research the damage the blows to the head may be causing. Scott, the nfl is looking at equipment changes and even new kinds of turf that could reduce head injuries. John blackstone reporting for us. John, thank you. A mother remembers her murdered daughter. Was the killer online . And snowplows overwhelmed by a severe storm. The cbs overnight news will be man sternly where do you think youre going . Mr. Mucus to work, with you. Its taco tuesday. Man youre not coming. I took mucinex to help get rid of my mucusy congestion. Im go od all day. [announcer ] mucinex keeps working. Not 4, not 6, but 12 hours. Lets end this check this out, bro. Whats that, broheim . I switched to geico more savings on Car Insurance . Yeah brofessor, and more. Like renters insurance. More ways to save. Thats not all, brotein shake. Geico has motorcycle and rv insurance, too. Oh, thats a lot more. Oh yeah, im all about geico. Expect great savings and a whole lot more. Music introducing new ky touch gel cr me. For massage and intimacy. Every touch, gently intensified. A little touch is all it takes. Ky touch. Shoulders dont just carry pads. They carry your fans passions, hopes, and dreams and maybe, a chance at greatness. Because shoulders were made for nicole lovell, battled illness, bullying, and lived much of her short life on line. Saturday in virginia she was found murdered. Two freshmen are under arrest and don dahler is following this. At a press conference, tammy weeks tried to describe the daughter she called cole. She couldnt finish. Idol. Nicole touched many people throughout her short life. Yeah, i cant do that part. Reporter prosecutored charged David Eisenhower with first degree murder and Virginia Tech engineering student, 19yearold natalie keepers charged with helping him commit the crime. Commonwealth attorney, mary pettitte. A very preliminary determination of the cause of death is stabbing. Eisenhauer, a former track star. According to documents he said i believe the truth can set me free. Lovell, was last seen at her mothers blacksburg, Virginia Home wednesday. Her body was discovered saturday, lying on a road in north carolina. Lovells father david and stepmother terry stayed in touch with the teen through social media but were concerned about her activities on web sites ultimately met her accused killer. Are you aware she was active on these teen flirt sites . We know that there were some issues at one time with her on these sites. And we addressed them. And i guess, we didnt do enough. Reporter the suspects are being held at this jail without bond. They have not yet entered a plea, scott. Nicole lovell, her funeral will be held thursday. Don, thank you. Snow stretches for 1,000 miles. The candidates got out of iowa just one step ahead of a storm that could still spawn tornados. Heres david begnaud. Tonight a blizzard sweeping Middle America from colorado to wisconsin. More than 13 Million People are under the threat of winter weather. Nearly a foot of snow has fallen hours. In kansas, vehicles had to be dug out. Blowing snow has made driving treacherous, with little visibility. Big rigs have become stranded. Some sedans didnt have a chance. Even snowplows were struggling. The snow cut power to at least 1,600 customers in lincoln, nebraska where monie and lee hedrick live. A moment where you go back to where people didnt have power. You have to learn how to adapt. Reporter elsewhere today unusually warm from chicago to new orleans. Nashville set a record, 75 degrees. That warmth combined with strong winds will cause severe thunderstorms and a looming threat of tornados for nearly 9 Million People from the gulf coast to illinois. Tonight, we are in mississippi and right now the National Weather service out of jackson confirms there is a tornado on the ground in mississippi. Being urged to take cover right now. Well check with you tomorrow. Millions of people will be in the path of the flood of super the super bowl is coming sunday here on cbs. But first, a word from the sponsors. Heres demarco morgan. Each morning i get up i die a little cant bear to stand on my feet take a look at your self reporter these singing sheep hope to have football fans flocking to the honda dealer. Whether you are an animal lover or one with a sweet tooth and move to go an octave higher. Be ready to be flooded. This years super bowl ads. Its hard to resist great taste. What does the super bowl mean to advertisers . The super bowl for advertisers one of the last big things for them to put their brand in front of the most people in america. Reporter companies are shelling out 4. 8 million on average for a 30second spot. Thats 160,000 per second. Over here we have their alphabet. It was called emoji. Reporter during last years super bowl, smaller brands, avocados from mexico spent 10 of their budget for an ad. I mean, double dipped. Reporter the Company President , alvare luce. Giving an example to brand that could participate, or compete, share the stage with reporter the brand grew 33 . The lesson, the ad that wins has a message that resonates. Budwiseer. And a brand that sticks for years to come. Just one look demarco morgan, cbs news. Thats the overnight news for this wednesday. For some the news continues. For others check back with us later for the morning news and cbs this morning. From the Broadcast Center in new announcer this is the cbs overnight news. Welcome to the overnight news. The devastating zika avirus continues to spread. The first known cases reported in ireland, chile and nicaragua. Zika is moving like wildfire through latin america and caribbean. The World Health Organization declared it a Public Health emergency. The virus is carried by mosquitoes. And most people dont even realize they have win infected. For pregnant mothers the virus can be devastating, some times causing miscarriage and birth defects. Brazil is ground zero. The countrys Health Officials are warning this summers olympic games. Dr. Jon lapook has more. From the city of recife. Reporter i left 30 soldiers with Health Workers going house to house here in recife, places like this looking to identify and destroy mosquitoes and to educate the local population about prevention. Health workers are spraying their way through part of south america. Hoping to eliminate mosquitoes, the carrier of the zika virus. Doctors in brazil are seeing a spike in infants with microcephaly. Were you sick at all . No. Reporter the birth defect which results in a small head is suspected to belinged to the zika virus. Dr. Angela rocha has been a pediatric diseases specialist a huge generation of babies with problems, rocha told me, a huge, social, economic and Public Health problem. She said she had never seen anything like it. Of the 28 countries and territories where the virus has been transmitted brazil has seen the largest outbreak with estimated 1. 5 million cases. The situation meets the conditions for a Public Health emergency. Reporter world health coordinated international the virus. Infect 4 Million People in the americas over the next year. Least 31 reported cases in the returning to the u. S. From imported infection from European Union haggles over people. 50,000 through greece. Europe in january alone. The netherlands floated an idea the greek island. Migrants get off the boats and be taken back to turkey. Denmark going one step closer, confiscating migrants valuables to help pay for their stay. Reporter when zarif abdella and her four small children arrived in denmark she had nothing left. We used to have everything, she said, house, cars, jewelry. We had to sell it all before she left raqqa, syria. Now under the new law, the Danish Government can seize any cash and valuables worth more than 1,500 to help pay for her family upkeep. She left her husband behind in turkey and it makes seeing him much harder. It blocks migrants from bringing immediate family members to denmark for at least three years. Nicola bendixon said delaying a cynical and so evil. It is, i dont really, i dont know how you can do things like that. Reporter denmark is struggling to cope with an influx of more than 20,000 refugees last year. One of the highest per capita in europe. Politician marcus knute. This is a deterrent . You could put it that way. It sound very tough. Alternative is that we simply dont have enough empty beds, we dont have enough space, we cant look after the people who come here. Reporter the government says making migrants help pay for their stay is only fair. Danish citizens on welfare also have to give up their cash to qualify. But bendixon said it is not about the money. The cost of an Asylum Seeker in denmark is so much bigger than whatever people are carrying on them. It is really ridiculous. People away. Thats the purpose of it. Zarifa told us the new laws have not scared her away. When you have nothing left, there its nothing left to lose. A british mother who took her young son with her to syria to join the Islamic State has been sentenced to six years in jail. Arrested after she returned home, claiming it was all a mistake. But the judge called her a liar. Allen pizzey reports. She told her family she was taking her 1yearold son on holiday in turkey and ended up in an Islamic State in syria. The 26yearold claimed it was all accidental. But according to a Police Statement she self radicalized by viewing extremist material on the internet. She was not naive. She had absolutely clear intentions before leaving. Images recovered from her own, show her posing, holding a gun, and several showed her 1yearold son doing the same. She sent a message to her sister, hey, babe we crossed the syria living there. It was never my intention to enter into syria. She told British Police the love affair was shortlived. I didnt want to be in syria. Immediately we were there. The other women were like this place its hell. This place is hell. This place was raqqa, where she was kept in a large house with single women. Raqqa blefd to be guarded by up to 5,000 is fighters. She told counterterrorist return, after three months in half a mile from the turkish border. I said, stop the car. Syrian dollars at him. 50. Grabbed my pampers and everything. Ran, ran, ran. Her son is in state care. Allen pizzey. Small towns across the after walmart closed 154 stores last week. Walmart express stores. Some open for a few months. Many communities had come to rely on them. David begnaud has the the story from texas. They chose to come here. Then when they put the other Grocery Store out of business they want to close. Talk about pettitts, a mom and pop, mainstay in the small town for 60 years. Larry deeds was coowner. What made you close . Business. They just quit coming. Reporter when walmart moved in last year, whiterights mayor, allen west said competition from wal marlt was a good thing. Now it is leaving. It will hurt the city financially. It will hurt the citizens economically. Getting a look at not only the effects when walmart comes into town, but also when they leave. I think that is a double blow reporter now that walmart has closed. Aretha thompson will have to drive half an hour to the closest Grocery Store. Where will you buy your groceries now . I dont know. Wont be walmart. Im done with walmart. The cbs overnight news will be right back. K on my longterm control medicine, i talked to my doctor and found a misspiec yesterday we brought you oncedaily breo prevents asthma symptoms. Breo is for adults with asthma not well controlled on a longterm asthma control medicine, like an inhaled corticosteroid. Breo wont replace a rescue inhaler for sudden breathing problems. Breo opens up airways to help improve breathing for a full 24 hours. Breo contains a type of medicine that increases the risk of death from asthma problems and may increase the risk of hospitalization in children and adolescents. Breo is not for people whose asthma is well controlled on a longterm asthma control medicine, like an inhaled corticosteroid. Once your asthma is well controlled, your doctor will decide if you can stop breo and prescribe a different asthma control medicine, like an inhaled corticosteroid. Do not take breo more than prescribed. 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