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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

SAN DIEGO (KGTV) - It's the perfect weekend to get out and enjoy San Diego!The 10th annual San Diego Festival of Science & Engineering returns to Petco Park, packing the ballpark with more than 130 free exhibits. The expo will give attendees hands-on opportunities and experiments centered around STEM education.Seaport Village will also host the free Spring Busker Festival, featuring professional street performers displaying their incredible talents and acts that are sure to amaze.MORE: Exploring San Diego funComedian Jeff Dunham and San Diego Film Festival will also headline this weekend.Here's a look at what's going on around San Diego this weekend:THURSDAYJeff DunhamWhere: Valley View Casino Center; Cost: Comedian Jeff Dunham brings his talent for many identities to Valley View Casino Center with his Passively Aggressive tour. Dunham's show will take on a special plot, as his cohorts Walter, Achmed the Dead Terrorist, Bubba J, and Peanut consider bringing a new member into their lives. San Diego Film Week 2018Where: Museum of Photographic Arts; Cost: - 0(Thursday - Sunday) San Diego's ten-day celebration of cinema will feature more than 100 local, national, and international films at the Museum of Photographic Arts and other locations around San Diego. The festival also includes workshops, parties, and panels.FRIDAY 1416

SAN DIEGO (KGTV) — It's a new season with new threads for the San Diego Padres.The Padres unveiled new home and away sets of uniforms sporting the team's classic brown colors during a fashion show-style event at Petco Park Saturday.Third baseman Manny Machado, first baseman Eric Hosmer, and shortstop Fernando Tatis Jr. were on hand to model the new look the Friars take into 2020. Two styles of the new uniforms featured a return to pinstripes, one on a white base reading "Padres" and the other on dark gray reading "San Diego." The third uniform was brown with gold "San Diego" across the chest and dark gray pants. 627

SAN DIEGO (KGTV) - It's rattlesnake season year-round in San Diego but now is the time they come out in full force due to warmer temperatures.San Diego Animal Services says the number of urban sightings this April is higher than this time last year, 94 versus 87. However, for the whole year, sightings are down compared to 2017.Rangers at the Mission Trails Regional Park say hikers should not panic if they see a rattlesnake on the trail. They even recommend taking a picture if you're a safe distance away.RELATED: What to do in the event of a rattlesnake biteRattlesnakes common throughout Mission Trails are the Southern Pacific and Red Diamond. Each can be several feet long and can strike about half their body length.Hiker and volunteer guide Daryel Stager recently spotted a five-foot Red Diamond rattlesnake eating a possum."I thought it was pretty cool, I don't usually see them with prey they've killed," said Stager. "They want to be left alone and get some rays - like going to the beach."Experts recommend keeping dogs leashed so that they do not startle a rattlesnake off the trail.  1112

SAN DIEGO (KGTV) -- It’s back to school for many kids across San Diego County. For some, it means new anxieties in the classroom, but for others, it means facing their old foe: bullying. A new program aimed at helping students understand their emotions in an effort to stop aggressive behavior before it starts is sweeping through the San Ysidro School District. RELATED: New program tackles behavioral issues to reduce future crime and violence in school 464