中山便血鲜红色(中山长了痔疮的症状) (今日更新中)

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) -- In anticipation of Fire Prevention Week, Cal Fire is urging Californians to pre-plan for the worst case scenario.According to Cal Fire, homes today burn faster than ever, leaving just minutes to escape once the smoke alarm sounds.This year’s Fire Prevention Week theme is “look, listen and learn.” In support of the week, the agency is asking Californians to develop a fire plan and practice it.RELATED: Woman, mad at ex-boyfriend, accused of sparking massive Maryland apartment fireCal Fire offers tips on making the plan, such as checking to make sure fire alarms are working and making sure there are two ways out of every room like a door and window.Heating equipment is one of the leading causes of house fires, Cal Fire says. Space heaters often cause home fires. Cal Fire warns residents to keep anything that can burn at least three feet away from heating equipment.“As we approach Fire Prevention Week, now is the time to take a look around your home and see where your hidden hazards are,” said Chief Dennis Mathisen, California State Fire Marshal.RELATED: Lit flare thrown into car parked in Lake Murray neighborhood“That means go room by room, and really look closely at where you have items placed, stored, and plugged in. We all can do a better job of reducing our risks by being more fire aware and creating a potentially life-saving escape plan and then practicing it.”Check out the list below for more on this year’s theme: 1478

SAN DIEGO (KGTV) — In need of a summer job? Why not spend your days at Del Mar?The San Diego County Fair is hiring for seasonal positions helping in a variety of ways at the fairgrounds, from exhibit workers and parking attendants to more specialized positions like EMTs, electricians, and mechanics.One perk to working at the fair: Free admission during your time there, according to the fair.MORE SD FAIR INFO: What to know |Admission discounts | Parking and transportation | Rides and games | Fair foods | Concert headlinersAs of May 15, the fair has 315 positions that are still open.For jobs with vendors working at the fairgrounds this summer, openings will be posted on May 15 and then again on May 29.To check out what summer jobs are currently open, visit the fairground's website here. 803

SAN DIEGO (KGTV) — Legoland debuted a new land for youngsters as well as a train attraction for park guests Thursday.Park officials welcomed in the addition of Duplo Playtown and a new mini-locomotive in a ribbon cutting with families from Ronald McDonald House Charities. A special check presentation of ,000 was also made to Ronald McDonald House. The park says the new Duplo Playtown will give guests the best views of Miniland U.S.A. from high atop the theme park. The land is geared for kids five and under and features ten interactive areas with sounds and games to entertain.The new mini-locomotive, the Legoland Express, was also unveiled. The ride will sit at the edge of Fun Town, perfect for children to experience their first theme park ride and views of the park. 787

SAN DIEGO (KGTV) — Looking for dinner with a view?In San Diego, the best views are found up and down the county's coastline, according to OpenTable users. The dining website's rankings were pulled together 12 million reviews for more than 28,000 U.S. restaurants collected on OpenTable between June 2017 and May 2018.In San Diego, 10 restaurants took honors as one of the best places to grab something to eat that's just as beautiful as the scenery nearby: 479

来源：资阳报