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SAN DIEGO (KGTV) — Lifeguards say a swimmer who disappeared early Saturday in Pacific Beach has been found safe.San Diego Lifeguards say four friends went into the ocean around 1:30 a.m. across from the Ocean Blvd. and Garnet Ave. beach entrance. But one of the friends did not return, prompting searches throughout the morning by U.S. Coast Guard and lifeguard crews.Later Saturday, the missing person was located safe at a friend's house, the Coast Guard told 10News.The swimmer was reportedly celebrating his 21st birthday at the nearby Waterbar before the group went for a swim, according to San Diego Lifeguard Lieutenant Rich Stropky.Though the group told lifeguards the water was only waist deep in the area they were swimming, the swimmer somehow became separated. The person's clothes, wallet, and phone were also left behind when the group returned to shore, Stropky said.Saturday morning, a U.S. Coast Guard cutter and helicopter assisted in the search. 972

SAN DIEGO (KGTV) - It's a great weekend to get out and enjoy San Diego's springtime with music, brews, and some heavy machinery.Del Mar's Goodguys 18th Meguiar's Del Mar Nationals roars into town, giving car heads the ultimate opportunity to see hot rods, muscle cars, and more.On the music scene, Snoop Dogg and Warren G will kick off the weekend with a show at The Observatory, and American Mariachi will debut at the Old Globe Theatre.RELATED: Springtime festivals in San DiegoFor locals looking for a festival, you can't go wrong with Julian's Gold Rush Days or the San Marcos Spring Festival and Street Fair.Here's a look at some of the things happening around San Diego this weekend:THURSDAY 710

SAN DIEGO (KGTV) - In the wake of the Florida tragedy, the weapon used by the shooter - the AR-15 - is once again in the spotlight.RELATED: Florida shooting suspect to plead guiltyRolando resident Wendy Hauffen bought her first AR-15 five years ago."The magazine holds 10 rounds just like a standard handgun because in California, we're limited to 10 rounds," said Hauffen.Hauffen, a member of San Diego County Gun Owners, says state requirements actually make an AR-15 slower to load than a handgun. With the required so-called bullet button feature, gun owners need a tool like an allen wrench to release the magazine.But anti-gun violence advocates say the rifle is still more dangerous than a handgun."It's designed to be more accurate. It's designed to project a bullet faster and more lethally," said Ron Marcus, Director of Public Outreach for San Diegans for Gun Violence Prevention.Starting last year, state law extended the assault weapons ban to include the sales of the AR-15 with the bullet buttons. Owners can still keep their AR-15s, but they have to register the gun with the state by June."If a gun is used in a crime, we need to be able to know how it got into the possession of the person who has it," said Marcus."I don't think it's going to be effective at all...the law-abiding citizens are following the law," said Hauffen. "The bad guys won't be registering their guns."Hauffen says registering the gun at the initial purchase is sufficient, but Marcus points out some transactions, like sales between private sellers and family, are hard to trace.State officials haven't released numbers, but it's estimated there are thousands - if not tens of thousands - of legally owned AR-15s in California. 1738

SAN DIEGO (KGTV) -- In February, we spoke to Jelynn Malone from Mostra Coffee after her coffee shop won best roaster in the U.S. by Roast Magazine. Since then, things for small businesses like hers have been touch and loyal customers including high school juniors, Siya and Anoushka, wanted to help."A lot of businesses were closing. We both brainstormed about how we could help local businesses who have helped us in the past," said Anoushka." So they created a campaign called Loving the Locals. "We started a GoFund Me page and reached out to friends and family who were able to donate. With that money, we were able to donate to Mostra Coffee."And when Malone was ready to meet her donors she said, "I'm looking for adults, they didn't give me their names or tell me how much and I see these two young high school girls and they're like 'Are you Jelynn?'" To describe Malone as surprised was an understatement. "Then they hand over this large check to me and it says a thousand dollars and I'm completely shocked. I'm emotional, touched," Malone described. Malone's no stranger to giving back. A portion of her profits goes to farmers in the Phillippines, where she sources a lot of her product from. When the pandemic began, she donated gratitude boxes to frontline workers. All of her efforts never went unnoticed, even by young customers. "They [Mostra Coffee] continue to give back to community even during these difficult times and we felt that quality was important to us and it's what we were going for. We shared similar values and they were a great fit for us," Siya said. Mostra Coffee is the first business Loving the Locals has donated to. They have a GoFund Me and all profits will go to another small business once their goal is met. 1760

SAN DIEGO (KGTV) — In their push to reopen schools, some political supporters of President Donald Trump have cited COVID-19 research from a group of San Diego scientists, claiming it’s evidence we could be close to herd immunity from the virus.But one of the authors of that research says that conclusion is way off.One of the most prominent supporters of the herd immunity conjecture is Dr. Scott Atlas, a neuroradiologist and senior fellow at Stanford University’s Hoover Institution who became an adviser to President Trump this month.“There’s a pretty good chance that herd immunity requires way less infections because of existing immunity out there,” Atlas said in a livestream conversation with San Diego County Supervisor Jim Desmond. “It actually may have already been reached in places like New York. We don’t know, but it’s possible.”Herd immunity is the level of protection needed to effectively stop the virus from circulating, thought to be about 70 percent of the population. The “existing immunity” to which Atlas is referring has to do with T cells.“It's just a misunderstanding of the science,” said Dr. Shane Crotty, a virologist at the La Jolla Institute for Immunology who co-authored the groundbreaking research on T cells in June.Crotty and his colleagues found that 50 percent of people unexposed to the novel coronavirus had T cells that could recognize it. Scientists refer to this as cross-reactive T cells, and the study was replicated in other countries.Proponents of the herd immunity theory take the number of people infected with the coronavirus, add the number of people with T cells that can recognize the virus, and come up with a number around the herd immunity threshold of 70 percent. But the math doesn’t work that way, according to Crotty, in part because T cells only kick in once a virus has hijacked cells, meaning T cells alone can't stop a pathogen in its tracks.“We’re not saying those 50 percent of people have protection like they’ve already had the virus,” Crotty said. “We’re saying those 50 percent of people have a head start in responding to the virus, which is a good thing but doesn’t affect herd immunity.”Since the novel coronavirus is a new pathogen, scientists did not expect people would have tools in their immune system capable of recognizing it. Unexposed people do not have cross-reactive antibodies, Crotty said.But in a study published this month in Science, Dr. Crotty and his colleagues offered a potential explanation for the surprising T cell results: they found these cross-reactive T cells also recognized four other coronavirus strains that cause common colds.Their theory: the T cells were created in response to other coronaviruses but can recognize SARS-CoV-2 like a distant relative.“It's a memory of a cousin,” Dr. Crotty said.That memory may speed up the body’s immune response, which can normally take about a week for an unknown pathogen, Crotty said. But scientists aren’t sure yet what role T cells actually play in clinical outcomes.“We have no data and and neither does anybody else as to whether these T cells really help or not,” Crotty said.To answer that question, scientists would need blood samples for lots of healthy people and then they would have to closely study individuals who got infected.The La Jolla Institute for Immunology is raising money for that kind of research, Crotty said, but they’re not there yet. 3417

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