昆明 那个人流医院好(昆明20多天无痛打胎多少钱) (今日更新中)

New research suggests that antibodies the immune system makes to fight the new coronavirus may only last a few months in people with mild illness, but that doesn’t mean protection also is gone or that it won’t be possible to develop an effective vaccine.“Infection with this coronavirus does not necessarily generate lifetime immunity,” but antibodies are only part of the story, said Dr. Buddy Creech, an infectious disease specialist at Vanderbilt University. He had no role in the work, published Tuesday in the New England Journal of Medicine.The immune system remembers how to make fresh antibodies if needed and other parts of it also can mount an attack, he said.Antibodies are proteins that white blood cells called B cells make to bind to the virus and help eliminate it. The earliest ones are fairly crude but as infection goes on, the immune system becomes trained to focus its attack and to make more precise antibodies.Dr. Otto Yang and others at the University of California, Los Angeles, measured these more precise antibodies in 30 patients diagnosed with COVID-19 and four housemates presumed to have the disease. Their average age was 43 and most had mild symptoms.Researchers found that the antibodies had a half-life of 73 days, which means that half of them would be gone after that much time. It dovetails with a previous report from China also suggesting antibodies quickly fade.The results “call for caution regarding antibody-based ‘immunity passports,’ herd immunity, and perhaps vaccine durability,” the California authors write.That’s true, Creech said, but other parts of the immune system also help confer protection. Besides churning out antibodies, B cells develop a memory so they know how to do that again if needed.“They would get called into action very quickly when there’s a new exposure to the virus. It’s as if they lie dormant, just waiting,” he said.Other white blood cells called T cells also are better able to attack the virus the next time they see it, Creech said.Although circulating antibodies may not last long, what we need to know is if and how people remake antibodies if exposed to the coronavirus again and if they protect against another infection, Alison Criss, an immunologist at the University of Virginia, wrote in an email. “We also need to know if there is a protective T cell response” that reappears.Vaccines, which provoke the immune system to make antibodies, might give longer-lasting protection than natural infection because they use purified versions of what stimulates that response, she noted.Creech agreed.“This shouldn’t dissuade us from pursuing a vaccine,” he said. “Antibodies are only a part of the story.”___Marilynn Marchione can be followed on Twitter at http://twitter.com/MMarchioneAP___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content. 2967

NEW YORK (AP) — Mall owners Simon Property Group and Brookfield Property Partners are close to a deal to buy department store chain, J.C. Penney, out of bankruptcy and keep the chain running. Penney's lawyer Josh Sussberg announced the tentative pact, which will save roughly 70,000 jobs, during a brief hearing in bankruptcy court Wednesday. More than 600 stores are expected to be saved, USA Today reported.According to the Wall Street Journal, Simon and Brookfield will own about 490 locations and a group of lenders will own 160 stores.Sussberg noted that a letter of intent including details of the pact will be filed with the bankruptcy court the next day. The 118-year-old department store based in Plano, Texas, filed for bankruptcy protection in mid-May, one of the biggest retailers to do so since the pandemic temporarily shut down non-essential stores around the country. 891

North Korea is willing to hold talks with the United States, South Korean President Moon Jae-In said in a statement Sunday.The South Korean leader said he'd met with the North Korean delegation in Pyeongchang before the closing ceremony of the Winter Olympic Games, and told them that North Korea-US talks should happen "as soon as possible."Moon said the North Koreans indicated they were willing to talk with the US, and agreed that "the inter-Korean relationship and North Korea-US relationship should develop together."  537

NEW YORK (AP) - Equifax is saying that an additional 2.4 million Americans were impacted by last year's data breach, however these newly disclosed consumers had much less personal information stolen. 207

New York State has issued guidance on professional sports competitions as part of Phase Four of the New York Forward program.The state says professional sports can resume in the state, but with no fans."Ensure that no live audience, fans, or spectators are allowed to attend or permitted to enter any professional sports venue, even if an outdoor venue. Prohibit fans from congregating outside the venue and implement a security plan to safely disperse any individuals that gather outside of the venue," the guidance states.Several guidelines will also be in place for team staff, athletes and venue personnel such as:Maintaining six feet of distance whenever possible.Wearing appropriate face coverings whenever possible.Limiting the use of frequently shared spaces.Limiting the number of individuals on site at a given time.Ensuring all team staff, athletes, and venue personnel receive training on COVID-19 safety, proper hand hygiene, and cleaning and disinfection protocols.Limiting the sharing of objects.Providing and maintaining hand hygiene stations.Conducting regular cleaning and disinfecting of the venue and equipment.No sharing of food or personal items.Diagnostic testing for COVID-19 for all athletes and essential team staff with regular player access 48 hours before a competition.Daily health screenings for anyone entering the venue.The state says this guidance does not apply to collegiate sports, horse racing or auto racing.This article was written by Anthony Reyes for WKBW. 1506

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