Today, the dow had its worst oneday point drop, falling nearly 1200 points. Thats more than 4 . This is now the worst week on wall street since the financial crisis in 2008. And adding to the concern a california woman diagnosed with the virus and Health Officials have no idea where she got it. And lso tonight, new concern about the government response as a whistleblower claims federal Health Employees lack training and protective gear when they interacted with quarantined americans. And then those federal employees scattered into the general population. We have a team of correspondents covering all aspects of this. Meg oliver leads us off from wall street. Meg. Orter norah, irah, i have been talking to analysts all day here on wall street. Stoking fears was a warning from Goldman Sachs that the virus could slow Economic Activity across the planet. applause the coronavirus has infected wall street. Markets plunged for the sixth e nsecutive day today over fears of the virus spreading and halting global growth. The stunning selloff came as countries like the u. S. And germany received news today that patients with no obvious exposure to the coronavirus got it anyway, what some are calling a turning point. Why is the selling continuing . Because there is this fear of the unknown. Reporter cbs News Business analyst Jill Schlesinger says we g nt know how long the selloff will last, but people with 401 k s should not get out of the market right now. Even if youre going to retire in the next year or two, your money has to last you for 20, maybe 30 years in the future. So try not to do anything to upset the plan that you have in place. Reporter in washington, the Vice President stressed calm. After days of criticism, the administration had mishandled the crisis and rattled the markets. Our best estimate is that the threat to the American Public remains low. Ic reporter meg oliver, cbs r ws, new york. Reporter im carter evans in sacramento, where Health Officials are urgently trying to track down everyone who came in contact with the most recent u. S. Coronavirus patient. How she became infected is still unknown. This particular case could be the first possible instance of Community Transmission of covid 19 in the united states. Reporter that means she could just be the first of many infected by someone else in the general population. We now know she first sought care for flulike symptoms at north bay hospital in vacaville on february 15. Dozens of workers there are now being monitored for the virus. The hospital is less than 10 miles away from Travis Air Force base, where passengers from the diamond princess are under quarantine. Is there any connection . We have no evidence there is any connection with those patients and this individual at this time. Reporter as her condition deteriorated, doctors inserted a breathing tube, and she was on a ventilator when she was transferred to u. C. Davis Medical Center for specializedtd today, california goor newsom declined to say where the woman had been while she was contagious. The people that have been in contact with this individual have the right to know and in real time, they are. Reporter california also has an issue with its stockpile of protective masks for medical workers. Many are expired. But the state is seeking permission to use them anyway. Battles against the virus are ramping up around the world, across at least 48 countries with infections now on every continent, except antarctica. In japan, all schools in the country will be closed until late march. And now, the Pacific Fleet is ordering all ships leaving high risk countries to quarantine at sea for 14 days. California is now monitoring roughly 8400 people who arrived on flights from asia. There is also an urgent need here for more coronavirus test kits. The state currently only has about 200. The c. D. C. Is rushing to send more. Norah. Odonnell all right, carter, thank you. There is a lot of fear tonight so we want to bring in our chief medical correspondent dr. Jon lapook. You just heard carter mention that. What about the test kits . Reporter i just got off the phone with the c. D. C. And they said, yes, there was a problem with the test kits but they think they fixed the problem and they expect is it to go out widely. All 50 states in the very near future, maybe as early as the next day or two. Odonnell good news there. What are the symptoms of coronavirus . Fever, cough, and especially shortness of breath. Thats a big one. Odonnell how is it different from the flu. Reporter it can mimic the flu but covid19 attacks the lungs in very specific ways and thats why they get into so many problems and need the breathing tubes. Odonnell the shortness of breath. So what you can do to protect yourself . Some of this is stuff your mother could have told you my mother did tell me. Wash your hands for 20 seconds. Keep your hands under your chin. When youre sick, be responsible. When you cough, cough into your elbow. And we have to change the corporate culture. I have patients who say, im feeling sick but im going to take one for the team and go to work. You know what . Take one from the team and stay home. Odonnell my kids call that the batman when you sneeze. What about the shortage of masks . Do masks protect you. Reporter the thing about the masks is theyre meant to stop the particles from coming out, the droplets and they may protect somebody else from getting it if youre sick. But the c. D. C. , i spoke to them this afternoon, they do not routinely recommend them to people. Odonnell so good to have you here. Reporter great to be here. Odonnell dr. Jon lapook. And tonight were learning more ve peothe five people murdered at that mass shooting at a brewery near milwaukee. They ranged in age from 33 to 61 years old. The gunman who worked at the molson coors plant took his own life. Dean reynolds now on the search for a motive. Just a short moment of silence. Reporter milwaukee is followng the unofficial american postshooting protocols the thoughts and prayers and the sidewalk memorials to salve the wounds that will never heal. Got phone calls from family members out of the city, out of the state, saying, how is it going in milwaukee . Reporter today police ter today policenman, 51year old anthony ferrill, and the names of his five victims. All coworkers of the man who murdered him they were power house operators, they were machinists and they were traditions. But more importantly, they were husbands. They were fathers and they were friends. Reporter the molson coors brewery is closed for the rest of the week. Bout 1,000 workers there were about 1, when the shooting started. The gunman reportedly had a longrunning dispute with at expect such trouble from the family man across the street. Shocked. Never, never dreamed he would do tmething like that. Reporter the governor today ordered flags flown at half staff to honor the victims. There have been at least 11 mass killings involving firearms in wisconsin since 2004. Norah. Odonnell all right, dean, yhank you. Bo houston, nobody expected flooding on a bright, sunny day uut a highway was quickly under water when a massive pipe burst. Faucets went dry in a big part of the city. Amd Janet Shamlian reports there erre some dramatic water rescues. Reporter a massive water main break left parts of houston looking like it did in the aftermath of hurricane harvey. The flooding closing a major jreeways that circle the cities, cars and trucks suddenly submerged, drivers climbing atop their vehicles, waiting for rescue. Phe pipe that broke apart while undergoing repairs was eight feet wide and supplies as much as 50 of the Drinking Water to the nations fourth largest city. And just before they got to reporter suddenly across houston, homes, businesses, and the sprawling texas Medical Center had low water pressure or no water at all. Olhools dismissed early, and Early Voting Centers were forced to close. I cant shower, cant cook, cant wash, cant do anything. So this is about as worse as its ever been out here. Reporter First Responders used a highwater rescue truck, last used during harvey, to carry drivers to safety. With a major roadway shut down, traffic all over came to a standstill. Hours later, life is still not back to normal. Ip i anticipate that you will e obably have to boil water in the city of houston for the next 24 hours. Reporter this road was under several feet of water until just a short time ago. Is receding very quickly. Rossity, the hter issues School DistrictJust Announced it would close all of its schools tomorrow. Norah. Odonnell wow, all right, janet, thank you. Outside philadelphia tonight, police are investigating a horrific crash at a daycare center. Officials in upper southampton township say a bmw smashed intoe ont of the school as more thannd four years old, were napping. At least four children were taken to the hospital, one with ierious injuries. The driver, a woman orom philadelphia, suffered injurys. We t minor injuries. We turn now to the 2020 campaign, two days before the South Carolina primary. New polls suggest joe biden could score a muchneeded win, but now a late attack on biden from republicans is drawing his former boss, president obama, tto the fight. Ed okeefe reports tonight from spartanburg, South Carolina. Reporter former Vice President joe biden appears on the verge of a win in south hrolina, so most of his opponents are looking ahead. Benator bernie sanders, the national frontrunner, marched with supporters in north carolina. The establishment, in case you havent noticed, theyre getting very nervous. Reporter while Michael Bloomberg rallied in texas. If you want somebody who has the resources to beat trump, thats me. Reporter this super tuesday, voters from the redwood forests of california to the gulf stream waters of alabama will award about onethird of all available delegates. Bloomberg today tried again to raise doubts about sanders health. The senator had a heart attack last year and has not released all of his medical records, including key data about his heart health. Bloomberg, who has two stents, erovided a detailed doctors note that says his heart health is normal. For some candidates, the way forward is through the past and the legacy of president obama. I was incredibly proud to serve with barack obama. Were going to build on obamacare. Reporter mr. Obama has no plans to endorse a candidate, but his attorneys are calling on South Carolina tv stations to stop airing a republican super pac ad that takes comments out of context that suggest criticism of biden. A new poll out today found three in five registered democrats actually believe the former president has endorsed a candidate, most believing hes supporting biden or bloomberg. But as we said, mr. Obama has no current plans to weigh in. Norah. Odonnell all right, ed, on the campaign trail tonight, thank you, ed. Tonight, Actress Lori Loughlin is fighting back against charges that she and her husband paid a half Million Dollar bribe to get into u. S. C. , while posing as athletes. Prosecutors tried to withhold evidence that can clear the couple. Prosecutors deny that allegation. Today, janet set a trial date of october 5. Tonight, a blizzard is burying parts of upstate new york. Heavy lakeeffect snow and 16 mileperhour gusts are causing whiteout conditions near buffalo and syracuse. The storm whipped up a snow nado a twister with snow and kicked up big waves on lake erie. A stretch of interstate 90 was shut down in pennsylvania, and some areas could get up to four feet of snow by saturday urdayng. Morning. Get out yo get out your skis. Tonight, a cbs news exclusive. A juror in the Harvey Weinstein aiial explains how he and other members of the jury reached their verdict this week. Weinstein now faces up to 29 years in prison. The juror, drew, asked us not to mhare his last name. He sat down today with cbs this srnings gayle king. The jury convicted on criminal sexual act in the first degree, and thirddegree rape. D thats correct. Reporter how did you all reach that conclusion . It was our deduction and interpretation of the law, regardless of behaviors before or after an alleged incident, on this day, at this time, in that place, can you do that . And the answer for the convictions is no. Ad thats a crime. Reporter and it was that simple that you no, there was nothing simple about it, nothing simple about it. Reporter but when you were saying the before and after, you said you didnt really take that into account. You really focused on this particular act on this particular day. 100 . Odonnell and you can see gayles full interview tomorrow on cbs this morning. There is still much more news ahead on tonights cbs evening news. Theres a new report out tonight that reveals an alarming rise in pedestrian deaths. Were going to look at whats behind this. Also, canada has a message for harry and meghan, and its going to cost them. L d well visit a choir dedicated to keeping alive an american cultural treasure. Millions of patients are treated with statinsbut up to 75 persistent cardiovascular risk still remains. Many have turned to fish oil supplements. Others, fenofibrates or niacin. 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Distracted driving and walking with smartphones are factors as are drug and alcohol abuse and ing weather bringing moremore pedestrians outside. 21yearold Angelina Pinedo was walking to her sisters house in h,dondo beach, california, when she was killed by a hitandrun driver. My baby sister had the most amazing soul. And i wouldnt be surprised if she would be here telling me to forgive that person. Reporter threequarters of pedestrian deaths happen at night, most on local roads and away from intersections. The governors Highway Safety associations russ martin says drivers and walkers distracted by smartphones is a growing problem. An we see drivers driving distracted and when a perse ss e pedestrian. Reporter to cut these deadly crashes the Study Reports adding crosswalks and improving lighting. Certainly if drivers and walkers put their cell phones down too, that would help. Odonnell really important information, thank you, kris. 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