S a warning from top hotel officials. If you have recovered from the kroovb, you may not be immune from getting it again. And donations could be the key to saving lives during this pandemic. The first of its kind transfusion happening in San Francisco that doctors are hoping will curb the outbreak. I dont like how people are coming out of the county. Stay in your own county, stay at home, stay safe. Warmer weather has crowds of people ignoring the stayathome order and flocking to california beaches. A new warning from the World Health Organization. People who have recovered from the coronavirus. Im juliet goodrich. Betty yu has more on why top doctors say if youve already had the virus, there is a chance you could get it again. Betty . Reporter theres been a lot of talk that antibodies would make people safe to resume normal life. Its unkno antibodies are protective, what degree of protection they provide, and for how long inform a newlypublished scientific brief, the World Health Organization said there was currently no evidence that people who have recovered from covid19 and have antibodies are protected from getting a second infection. Some governments have suggested that the presence of eent bodies could serve as an immunity passport or riskfree certificate that would allow people to return to work or travel. To the state that the presence of antibodies against covid19 offer protection. That may be true. It may not be true. Reporter professor of epidemiology at uc berkeley says protection from the coronavirus could last a few weeks, months or years. But its unclear at this time. There are a lot of feshs diseases wherep infection doesnt protect you from future infection. An example is hiv. Hepatitis c. Reporter people who say they are immune because they have received a public test result may ignore Public Health advice and increase the risk of continued transmission. The other thing to remember is that only a small number of people in the bay area are going to have will have it infected and have antibodies anyway. Theyre probably on the order of 100 , maybe. So its not gonna be, like, half of the population has these. Reporter dr. Rutherford added when the time comes, he is advising people to get their flu shots because we will have covid19 and influenza circulating at the same time this fall. The big unknown in all of this is how coronavirus reacts to treatments that have worked in fighting other viruses. For instance, convalesce end plasma. It might help those still fighting the disease. To see if that might be effective, a first of its kind transfusion took place at ucsf. Reporter the procedure happened late last my. We do not know the condition of patient tonight. Its what this transfusion could do in the future that has some doctors have been hopeful in the fight against covid19. The transfer of convalescent plasma has been done before. We can decide whether or not this actually works. We think it might. But covid19 is covid19. We need to know if it works. Because if it does, then therell be more enthusiasm for using it as standard therapy. Reporter plasma is the liquid part of your blood containing antibodies, which help fight an infectious disease. Transfusing it to sick patients has its history of success and failure. There is some evidence it was a benefit for the sars epidemic, and there may have been some benefit also for the swine flu, also known as h1n1. But it did not seem to be effective in treatment of ebola disease. Reporter a team of doctors say there was no matching plasma at the red cross or local blood banks until Stanford Medical Center heard of the need and offered one unit of match plasma. Then the magic happened. Reporter these transfusions happen under what conditions . I think were going to first start with folks who are feeling really badly in general. So the sickest patients. People in the icu or ventilated. Reporter ucsf has seen an estimated 60 patients with 23 transferred into the ikrshgsz u since the pandemic icu, since the pandemic ignited. One issued be the low supply of convalescent plasma at blood bank. Were excited that people sore generous to want to donate themselves, and to help loved ones or others. Reporter if youd like to help and donate you can contract the red cross or any local Healthcare Institution that is collecting covid19 plasma donations. It has to be emphasized the behavior of the virus is a big unknown. All of this is in the early stages. That study could take months to complete, and if it shows promise, a long while to get approval. Child abuse calls have declined during the shelz. During the shelz. But experts say that is not necessarily a good thing. Financial pres housing and stress can be trishings for abuse. The fehr is that children may be suffering in isolation. What were really hoping for is that folks that are still seeing kids maybe in a virtual capacity can be even more vij land and alert about checking for signs and concerns of abuse. Since the shelterinplace orders took effect, call centers have seen calls decline by as much as 70 . Officials have told people to stay at home this weekend. But the warm weather disagrees. Big crowds at beaches all across california. Thats the scene in huntington beach. Physical distancing was enforced. Officials told residents to stay a surfboards distance apart. Orange and Ventura County beaches are open in. Neighboring los angeles, beaches did remain closed. Everyone else will come here from different cities too. Its very crowded. Here in the bay area, a similar scene at ocean beach. Most did seem to be keeping their distance. Traffic was so bad some neighbors took matters into their own hands. A few barricade on mt. Diablo is trying to prevent nonresidents from entering. Some cars ignored the barricade, even with them standing there. And once they got to the entrance and saw the gate closed, they had to turn around. Have them turn around here where its safe, and not go all the way to the end of the road. We do not feel like theres enough support from the state park to recognize their obligation to the road. They want a park ranger to staff the barricade. But partial Officials Say they dont own the scenic road and will continue to work with other agencies to monitor traffic conditions. The empty roads are at least allowing caltrans to get a headstart on Major Construction projects along 101 in San Francisco and elsewhere. Traffic is fairly light. An army of workers now racing ahead with the 101 280 overpass. A day in, the northbound bridge deck is already take shape. Were gonna start pouring concrete tonight. When its ready, were gonna open up this krail, the temporary barrier, and bring that southbound traffic over onto what is the northbound structure. Itll move all the way down through here when youre seeing us do this work. And itll all be done. And itll be s back onto the southbound alignment. All of this is supposed to be an 18day project. Because of the shelterinplace, it could be done in half of that time. Shotspotter technology has helped police nab a suspect wanted in a freeway shooting in the east bay. Joshua walk was arrested on thursday. He allegedly shot at a car on interstate 80 in san pablo. The driver of the car that was shot says he had been chased by another driver before the shooting. She was not injured. Investigators used a network of sensors in putting surveillance cameras and automatic license plate readers to identify the vehicle as belonging to watts. A new clue in the mysterious absence of kim jongun who is believed to be grateful ill or dead. Plus, where dozens were arrested for celebrating a religious holiday together. And many are leaving their hearts in San Francisco today to help those impacted by the coronavirus outbreak. The light over my shoulder is the light on top of the transamerica tower lit up in honor of healthcare workers. Tomorrow is gonna feel different because of the fog. Well talk about how things change for sunday. Rumors, but they are only rumors, continue tonight the health of north korean leader, kim jongun. Kim hasnt been seen in public since april 11th. The u. S. Is reportedly monitoring intelligence that the leader is in grave danger after surgery. A special train possibly belonging to the leader in a resort town on video. Kim missed another public appearance today, fuelling rumors and reports that he is either grateful ill or even dead. Millions of muslims are observing ramadan, the islamic holy month. It involves daily fasting and prayers. In the era of social distancing, some countries are struggling to keep worshippers apart. In south africa, at least two dozen muslims were arrested for praying together in congregation which is forbidden under lockdown rules. In indonesia and pakistan, religious clerics have pushed politicians into opening up mosques. But over in britain, muslims are urging ramadan observers to stay home and pray. Its a message this British School boy has taken to heart. He was so worried his family wouldnt have anywhere to pray during ramadan, he built his own athome mosque. Out of cardboard. Video meetings continue to skyrocket as people continue to shelterinplace. Now facebook is aiming to make them bigger and better. A new version of their app called messenger rooms. Thatll allow users to host meetings up to 50 people without a time limit. Users can invite anybody to access the meeting through facebooks website or their messenger app. In San Francisco, churches are becoming foodhubs for their kong gants and community. The San FranciscoAfrican American coalition partnered to give out hot meals. The coalition has delivered more than 30,000 meals every day to close placed at risk for covid19. A soishllydistanced singalong in San Francisco this afternoon. People in San Francisco came together to sing Tony Bennetts 1962, recorded on columbia records, i left my heart in San Francisco. The city might have changed, the song remained the same. Mark robinson has sung in clubs across the city. He said todays performance was different. Ive had in weird gigs. But playing to an empty union square, its right up there. I think for this, youre gonna feel that there are people out there. And i can kind of use my imagination for that. Former mayor, willy brown, who used to hit all the right notes as a politician did his best with the old standard today. The singalong was initiated by the citys chief of protocol. Head to kpix. Com to see all of our reporting. And for more good news . From that quintessential moment today of the gatherings around i left my heart in San Francisco. Heres another one. Take a look at the top of the transamerica tower right now. If you hadnt heard yet, that light on the top of the tower is not always lit. It was lit a couple weeks ago, specifically to honor healthcare workers. And the scene tonight with the fog coming in right now, just surrounding the tower. Its just beautiful. And its also wielths a hin for whats coming tomorrow. Back up toward the city, Salesforce Tower in this view. Riebt there. Right about there and using the camera, we can see toward the bay bridge. Patchy fog here as well. The numbers stand right now, daytime highs which would have been just a few degrees off the average in some places. Morning lows are gonna come back down into the low and mid50s for tomorrow. It has been warm to hot out there over the last few days. Tomorrow gets a little bit cooler. And heres the start of the kay at 6 30. Right about sniersz tomorrow. Theres a marine layer around the coast. Some has worked its way back since the marine layer is gonna come back, the temperatures tomorrow are not gonna warm up as much. These are just about five to six degrees below where we were today. So san jose, going to 78. Palo alto will hit 73. Numbers for the east bay come in around 80. San ramon to 74. Livermore 77. North and east bay numbers, san leandro goes to 71. San rafael hits 73. And as we go up top, 78 up there. St. Helenna and windsor will have you beat in the low 80s. The temperatures only come down for the next couple of days. Tuesday shouldnt be as hot. But its gonna be close. And after tuesday and wednesday, were gonna cool back down to average. Those numbers by the end of next week at the mid70s for inland spots, thats where we should be for this time of year. And daytime highs in the bay should come to around the upper 60s as well. Thats the forecast for now. Looks good. California is turning to Artificial Intelligence to help fight the pandemic. Companies like facebook, bluedot and others are using mapping technologies and cellphone data to predict which hospital will be hit hardest. And californians are really staying at home. We are literally seeing into the future. And predicting in realtime, based on constant updates of information where patterns are starting to occur. I cant remember the last time this happened. Im glad its back. Two for saturday night. Longtime viewers know the drill. Its not just one sports segment tonight. Tonight you get two. And what a day it was for the 49ers empire. Wow im original. One of a kind. You feel me . Love ya. Oop you look cute. Better than you wherever drama pops off pop my 100 allwhitemeat classic or spicy popcorn chicken combo for just 5. 99. Pojust like covered california teammateshelps you finder find a way to win, Health Insurance you can afford. Theyre the only place you can get Financial Assistance to help pay for Health Coverage. Plus, this year, the state is providing more help than ever before. And because a new law requires californians to have Health Coverage or pay a penalty, covered california has made it easier to get financial help, but times limited. Visit coveredca. Com or call to enroll today. You may not be thinking about blood donation, but blood is needed to save the lives of people who are sick with a range of illnesses. Its easy and safe to give. If you are in good health, please donate. We need heroes now. Visit red cross blood dot org to schedule an appointment. Is so irresistible, youll wanna eat them anywhere, so dont resist pop em outside, or on the go, or on the way home pop my 100 allwhitemeat classic or spicy popcorn chicken combo for just 5. 99. Sglo maybe he had thoughts about another run at 73point stances a game. 49ers tackle hung up his cleats today for, well, not karaoke. I heard that you settled down and you found a girl and youre married now [ singing ] vernon davis with him. Stehley gonna be. He played his entire career in the bay area. Allpro, 2010 alldecade team. The 35yearold said his body told him it was same to say adios. Last season was by far the most difficult on me and my family. My body is breaking down. The time has come to step away. I leave with my head held high, knowing i gave my all to the game. You always knew the right thing to say. You always know how to get me going on the football field. And ill always thank you for that. Not even an hour later, the 49ers pecked up number 71 here. Tackle Trent Williams with the redskins via a tade. Trade. It cost two draft picks to get the seventime pro bowler. And williams did not play last season. After seeking a trade, he was the fourth overall pick in the 2010 draft. Played four seasons for the then redskins offensive coordinator kyle shanahan. Weve got another one. 49ers made some more key moves. The things you have to do if you want to make it back to the super bowl. This virus is testing all of us. And its testing the people on the front lines of this fight most of all. So abbott is getting new tests into their hands, delivering the critical results they need. And until this fight is over, we. Will. Never. Quit. Because they never quit. Id make sure there were more textbooks in schools. Im a teacher. Ive seen the need, but my girlfriend here likes to say. Dont just talk about it, be about it. And were about the 2020 census. Because when everyone gets counted on the census, it helps inform public funding in our neighborhood for the next ten years dont just talk about it be about it complete the census online, by phone or by mail. Shape your future. Start here at 2020census. Gov. For over 80 years, complete the census online, by phone or by mail. Nissan has been with you through thick and thin, and now is no different. Were offering Payment Options for current owners. Our Service Departments are here to help. And now were offering more help. No payments for three months. Plus, well cover your payments for up to two additional months. This is help when you need it. That could mean an increase byin energy bills. You can save by setting your heat to 68 or lower. Unplugging and turning off devices when not in use. Or just letting the sun light your home. Stay well and keep it golden. Eight. That is the number of teams who made it back to the super bowl the year after they lost it. To be the ninth, 49ers had to reload the roster. Say gonna be to running back matt breada. Six touchdowns in three seasons. The deep also traded wide receiver marquise goodwin. Hell run routes with the philadelphia eagles. Got a sixth round pick for him. Injuryplagued the last two seasons. San francisco selected three players on the final day of the draft here. West virginia colten mckivitz. They drafted georgia tight end, charley werner. And wide receiver jajuan jennings. Just two picks on saturday. Both in the fourth round. They nab guard john simpson from clemson. And Louisiana Tech cornerback. Evan weaver was taken in the sixth round by the cardinals. Last season with the bears, he led the nation in tackles and was a firstteam allamerican. Shoutout to cal, Jaylen Hawkins who signed a deal with the falcons. Picked up in the fourth round. Linebacker out of stanford, a seventh round selection by the eagles. Thank you. We step by step, were going to figure this out. Were gonna find a way through this. Were working really, really hard in hospitals, our nurses, our techs, all the docs. Its about staggering when people get sick so that the hospitals can cope. Were gonna go through an awful lot of these. All across puget sound, people have been stepping up