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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) - Looking for love in all the wrong places? San Diego is one of the top spots in the nation for singles, according to WalletHub.The website ranked cities based on data including share of single population, number of online dating opportunities, and nightlife options.The top cities included: 321

SAN DIEGO (KGTV) - Local high school students who are trying to take the ACT college admissions exam say that their test dates keep getting canceled because of the pandemic. ABC10 News discovered that some frustrated students are planning to drive or fly to other cities to take the exam in time for college applications.“It's just been a very unsure time,” said Betsy Mains on Wednesday. Her daughter, Chelsea, is already feeling the stress of starting her senior year at University City High School through a remote learning program. Mains said that’s now compounded by fears associated with getting her ACT test done in time to apply for college. “These tests are required for a lot of the applications and a lot of the scholarships,” she added.“The communication's just been very poor. They've had to cancel tests. They didn't tell folks they were canceled. Their website crashed,” Michael Coleman told ABC10 News on Wednesday. His daughter, Sam, is about to be a senior at Canyon Crest Academy.She’s facing a similar challenge. Both students' families say their ACT tests have been canceled and rescheduled multiple times because of a lack of testing sites.“The first thing that I could find that was remotely possible for her was in December here in San Diego. That’s problematic because the college application process starts before then,” said Coleman. He told ABC10 News that parents have been looking for test sites in other cities.“I started putting in different zip codes to see if I could find something somewhere else. I eventually did get one in San Bernardino,” said Mains. “I found something in the Magic Mountain area a little sooner than December,” added Coleman.On Wednesday, the ACT sent ABC10 News the following information:Summer testing:In general, COVID-19 severely impacted testing centers’ capacity for spring and summer test dates. We rescheduled our planned April test date to June, and due to the demand and adherence to local and public health guidelines and social distancing requirements, the June and July test dates operated at limited capacity (i.e. limited seats for test-takers). Our teams performed a massive manual outreach campaign to thousands of test site administrators to better understand which sites were open and prepared to administer the test in a COVID-19 environment in line with local public health guidelines, knowing that conditions could change quickly in certain locations where the virus was surging.Our top priority is to provide testing opportunities for all who wish to pursue a path to college and career. We were able to provide makeup tests in certain locations for those impacted by last-minute cancellations and have added additional test dates [leadershipblog.act.org] to our regular national testing schedule this fall. COVID-19 has created many challenges for large-scale testing.We’re working to accommodate the demand and serve our customers, while acknowledging that seat and site capacity is subject to change, due to the changing nature of COVID-19. We’re in the process of adding additional seats to MyACT and encourage students to check back this week as seats in sites across the nation are added.MyACTWe know students are in need of scores and we are working hard to accommodate the extreme demand for seats in this unknown environment. We experienced some site degradation on Monday, July 27 due to high user volume and took MyACT down to improve system performance. We reopened the site this Monday, August 3 after automatically registering many class of 2020 and 2021 seniors impacted by summer test cancellations for our September national test dates.What we're doing for seniors + adding capacity:The majority of registered test-takers for June and July test dates were class of 2021 seniors. To help those rising seniors—impacted by summer test date cancellations and closures—meet their scholarship and application deadlines, we’re working to provide an accelerated fall registration experience. To the best of our ability, class of 2020 and 2021 seniors impacted by April, June and July cancellations have been placed in seats at sites that are currently open. Some of these students could not be automatically registered for fall test dates but we are doing everything we can to secure additional space for students who will need more options.In addition to the changes we’ve already made to add more capacity (opening up our Sunday testing to all students and adding new test dates [leadershipblog.act.org] in September and October), here are a few more examples of what we’re working on:? Pop-up sites in areas most affected by cancellations.? Partnering with commercial testing companies to share their already-existing space within communities.? Working with state Boards of Regents, colleges, and universities to help them administer “On-Campus Testing” for their students.? Working with school districts to help them become an ACT test site for their students (these are called unlisted test centers and are not available on MyACT. 5032

SAN DIEGO (KGTV) -- Keep an eye out for two new residents at the San Diego Zoo - two penguin chicks named Lucas and Dot. The three-month-old penguin chicks will reside in the Cape Fynbos habitat with a colony of 29 adult penguins. After weeks of careful planning—including providing the chicks with a private pool, where they learned how to swim the hand raised penguins got to see their new home. The two juveniles immediately started swimming and climbing rocks, while keepers vigilantly monitored their progress. Animal care staff said the initial introduction went very smoothly and the birds behaved exactly as keepers had hoped, but they plan to allow only closely monitored interactions for the next few days.“We will be pulling [Lucas and Dot] back at night,” said Debbie Denton, keeper. “We don’t want to leave them out unsupervised yet. We just want to give them a few days out here with the rest of the colony, and make sure that they are comfortable enough to do OK on their own overnight.”Lucas and Dot were hatched in San Diego from eggs supplied though a breeding loan by the Minnesota Zoo, which has successfully hatched more than 24 eggs since opening its African penguin habitat in 2011.    Guests can visit Lucas and Dot at their home in the Cape Fynbos habitat, inside Africa Rocks at the Zoo.    1379

SAN DIEGO (KGTV) -- Mixed Martial Arts fighter, Dean "The Boogeyman" Lister is asking the public to help him find a man he found inside his apartment. Lister, a Jiu Jitsu champion, has taken down opponents around the world - but he never expected a fight in his home. "I thought somebody was working in the apartment," he said, describing the man as covered in tattoos and wearing only a pair of boxers.Lister said the man wasn't making any sense, and soon Lister started to record him. In the video the man is heard saying that he went into the apartment because he thought it was a church. When the man realized that he was being record, Lister said he reached for a hammer - a moment that can be seen just before the video ends. Lister is a gun owner, and said he reached for his weapon when the stranger threatened him. At that point, the man got scared and Lister let him escape out the same window he broke in through. When police arrived, the man was gone. "I'm not trying to sound like any kind of saint," Lister said. "But whatever kind of money I lost, maybe it's not worth someone dying."Lister posted the video on Youtube and shared it with 10News in hopes that someone would recognize the intruder. "Hopefully he turns his life around," Lister said.   1327

来源：资阳报