Experts have been telling us it was inevitable but the news overnight that a Dallas Health care worker has tested positive for ebola, the first known case contracted in the u. S. , still came as somewhat of a shock. Mainly because the news puts into question the integrity of all of those measures and meticulous protocols weve been hearing about. The cdc said it was a member of the medical team who treated Thomas Eric Duncan who died from the disease last week. As to how it happened, officials only say it is a breach of protocol. A breach that raises question tonight. We have coverage starting off in dallas for us with park potter. Reporter Health Care Officials said they knew there was a chance that somebody else could be infected with ebola. But they were concerned it was a Health Care Worker wearing a suit. When authorities learn a Dallas Health care worker tested positive for ebola, they moved quickly to seal her apartment and car. Hazmat crews arriving this afternoon. Neighbors were notified. The mayor himself going doortodoor. Next door is really close to home. Reporter doctors say a health care at the texas Presbyterian Hospital had a fever. The entire process from monitoring took less than 90 minutes. They have not identified her publicly but she say she had contact with the late ebola patient Thomas Eric Duncan who was put on a ventilator and dialysis machine as his condition worsened and he became more infectious. The Health Worker wore a protective suit but officials believe there was a breakdown. At some point there was a breach in protocol and that resulted in this infection. They say sometimes it occurs as workers take off the protective suits. You may have fluid on your suit, infectious things on your hand. Getting it off without contamination is hard. One worker who contact with the Health Care Worker is being tested and along with 18 other people surrounding her and 48 other people who had contact with tome. This is obviously bad news, but it is not news that should bring about panic. Reporter officials insist that by careful monitoring they can prevent an ebola outbreak. And a day of bad news here in dallas, od news in omaha where doctors say the nbc freelance cameraman has turned the corner and showed a marketed improvement in his treatment. So breach of protocol doesnt tell us what happened. What do they plan to do making sure things go right moving forward. Reporter first they need to investigate what happened and then institute procedures around the country. Fewer people with the patient and Better Safety rules and make sure they are not followed. And this is not limited certainly to that hospital. Tonight the front lines in the fight of ebola extends from kennedy airport, to hospitals across the country where some medical workers worry whether they are properly equipped to deal with the ebola threat. Kristin dahlgren with that part of the story. Reporter when kelly fields encountered a patient with a high fever after coming from liberia she was worried. I just had a mask and gloves. I had no foot protection or hair covers. It turned out the patient had malaria. If we do get a true case of ebola, were not prepared for it. Reporter her employee, washington, d. C. Providence hospital categorically denied that and followed guidelines established by the cdc. Fields is one of a growing number of Health Care Workers like dr. Linda gurgis. I feel there is a gap in the information getting the information from the cdc down to the doctors on the front line. Reporter in a survey of almost 2,000 rns by National Nurses united, most havent been told about a policy for ebola admissions and they dont have enough eye protection and fluid resistant gowns. We can never do enough to feel everyone is completely prepared. We, in the next several weeks, are redoubling our efforts. That means more Training Like this drill on new yorks long island for all emergency responders. The first line of response for cdc is screening the callers that call into 911 so the people know what they are getting into before they get to the scene. Reporter starting this weekend, new yorks jfk is screening all passengers from ebola stricken patients. Including newark and ohare and other airports. They are trying to stop the disease from entering this country before more Health Care Workers are put to the test. Crittin dahlgren, nbc news, new york. Now to another health concern, a 21monthold michigan toddler has died from the enterovirus, it is diagnosed across 46 states and washington, d. C. And caused severe respiratory illness. Six people infected have died but it is not clear what role the virus played in all of the cases. St. Louis police say more than a dozen people were arrested this weekend in protests over the Police Shooting death of an unarmed 18yearold in ferguson this past august. And the protests arent over yet. More planned for tonight and tomorrow. Nbcs ron allen now with our report. [ sirens ] reporter it was the most serious confrontation in what demonstrators from across the country call a weekend of resistance. St. Louis metropolitan Police Respond in riot gear and say dozens of protesters were attempting to storm a gas station convenience store, some throwing rocks. The protesters insist it was a peaceful sitin and police have no reason to use teargas. I used milk to stop the sing. They pushed us back on the sidewalk. I didnt see who sprayed me. I wasnt doing nothing. Reporter at least 17 arrests of illegal behavior. Marking two months since teenager Michael Brown was shot and killed by murg usson Police Officer darren wilson. Browns mother out front demanding a grand jury charge the officer with her sons murder. Angry standoffs, crowds facetoface with officers at Ferguson Police headquarters. Several thousand people from new york to california organized for weeks. Activists, unions, ordinary citizens and leaders from ferguson. Youve been in this from the beginning. What do you think of all of this . Im very proud to no that even 61, 62 days after the killing of Michael Brown we are stronger than ever. Reporter today the message was in the music. Songs of protest at this conc t concert. The demonstration in harsh spotlight on ferguson, igniting another movement. Concerned citizens with a came to show there is more here than protests. The people who live here now embrace diversity. Reporter they are also concerned about businesses struggling. In this neighborhood there is still a lot of boarded up buildings, some damaged by violence and more protection in case there is more protests. Ron allen, thank you very much. Overseas, hong kongs leader said he will stay in Office Despite calls from student protesters for him to showdown. At issue is what they say is an unfair election system imposed by china. Ian williams reports zwlnchts this is a vasten camp in the shadow of the skyscrapers. Thousands responding to a call of force this weekend, that is the occupation of the financial heart entering the third week. Scuffles overnight at a separate site as protestered try to extend their barricades. While the hong kong leader accused them to be out of control. They are asking for his resignation and proper elections. [ inaudible ]. Reporter the protests had appeared to be running out of steam but it has fresh momentum this weekend after the government scrapped a plan meeting with student leaders. Theyve renamed this area umbrella square, the symbol of the bankruptcy movement and inspiring an outpouring of street art. They have transformed the drab walls of this government build into a display of post its and they have tents hunkering down for the long haul. For days or weeks or months. Reporter the biggest challenge since the tanna men square protests. How long will you stay . As long as it takes. Reporter nbc news, hong kong. This week u. S. Coalition had nine airstrikes. Six along the kobani border where isis is trying to move in. And the parents of peter kassig are not giving up hope for his return. I hope he will hear of this and of other conversations weve had or other times weve spoken in public, that way hell know we havent forgotten him, we havent abandoned him and we certainly do love him. You can watch the entire interview with kassigs parents tomorrow morning on today. Midterm elections are just 26 days away but president obama has been out of sight on the campaign trail this season. But this week he returns to the fray. Nbcs Kristen Welker has more from the white house. Reporter big name democrats have been blanketing the campaign trail for weeks. Im back reporter is suspected of testing the waters for their own future bids but noticeably absent from the main event, president obama. The president is not really wanted by democrats even in states that he carried in 2008 and 2012. Reporter hell likely stay away from places like alaska, iowa, colorado and pennsylvania. The penetration was palpable when Allison Grimes from kentucky wouldnt even say if she voted for the president. Did you vote for president obama in 2008, 2012 . This election isnt about the president. I know it is about making sure we put kentuckiy ands back to work. And Andrea Mitchell asks if shen wants the president to campaign for her. There is a lot of crisis in the world so i expect him to be in washington. Reporter the president may have given republicans an opening when he said his policies are on the ballot even though hes not. A vote for greg orman is a vote for the obama agenda. Once called the campaigner and chief and now he is a fundraiser and chief. He remains a huge draw that is the largest and best fundraiser weve ever seen. On wednesday he will headline a rally for the democratic governorage, the first big event of the cycle. A cautious campaigner with the senate hanging in the balance. Nbc news, washington. Tonight were keeping a close eye on weather looming over parts of this country. 76 million americans could be effected for days. For more im joined by the Weather Centers kelly cass. We have large weather and we cant rule out the possibility of tornados. So we have cities like dallas and Oklahoma City in the red danger zone for tonight and tomorrow even bigger cities to the east in chicago, st. Louis, lick rock, right down to the gulf coast. Make sure you have a way of getting the warnings. If you live in new orleans, get ready to lose your pour as the storms roll through. And on monday night and tuesday, including cincinnati, down into florida. And we are looking at the tropics coming alive in the atlantic, where puerto rico is under watch, and Tropical Storm gonzalo is expected to hit that area on tuesday. Thank you. When nbc nightly news continues, how when change is in the air you see things in a whole new way. Its in this spirit that ing u. S. Is becoming a new kind of company. One that helps you think differently about whats ahead, and whats possible when you get things organized. Ing u. S. Is now voya. Changing the way you think of retirement. cheering yeah touchdown whos ready for half time . Ok im going to draw something up new. Who ate the quarterback . Share what you love with who you love. Kelloggs frosted flakes. Theyre grrreat now that most americans have a cameraequipped smartphone in hand, nearly aspect of our lives is being captured on video, including our interactions with the police. So it is no wonder were seeing a growing number of raw and often ugly and sometime as brucive encounters with cops that appear to cross the line. We asked Pete Williams to look through the lens to put this in focus. Police in hammond, indiana, face a lawsuit after an officer smashed a car window and used a taser on a man, video taped by a son in the backseat. And then another taser used on a 62yearold woman walking away. A pregnant woman in new york city is suing after she tried to intervene as her son was arrested, a video showing an officer shoving her to the ground was recorded and made public by groups of members who follow police with cameras. They say people in minority communities do not trust the police. Before this teelg technology, we cried out and our voices werent being heard. And now that we are equipped with this type of information we are able to get this out of there. Every week brings another on you tube and picked up by the news media. But police who study Police Behavior said it doesnt mean there is new brutality. It is only with the advancement of technology that we are seeing a fraction of the encounters but it does not mean there is increase in use of force or Excessive Force for that matter. Partly there are more cameras on the street. More than 60 americans have a smartphone and many of Nationals Police say they should carry cameras too. Police car dashboards show when police are attacked but a growing number are wearing body cameras. A recent study in rialto, california, showed a 60 drop in force when police use cameras, and an 88 drop in citizen complaints. But even so, they say body cameras arent enough. They are not a substitute for the kind of training and preparation and deescalation skills you want officers to have and most importantly building relationships with the community. 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