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中山突然便血什么原因
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发布时间: 2025-06-02 15:04:05北京青年报社官方账号
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  中山突然便血什么原因   

CHICAGO, Ill. -- Scientists are continuing to develop new COVID-19 testing methods. Everything from throat swabs and saliva tests to breathalyzers are potential options. The federal government has ordered 150 million rapid antigen tests to help quickly identify cases in places like schools and disaster zones.Still, we're six months into the global pandemic and experts say we still need better and more frequent testing.Supply chain bottlenecks, long turnaround times and the looming flu season have many pharmaceutical companies scrambling for a better test.“There's been a great push and a lot of innovation has gone into developing new tests that might be able to be used in different scenarios,” said Dr. Emily Landon, an infectious disease specialist at University of Chicago Medicine.Abbott Laboratories’ sixth iteration of the COVID-19 test, known as “Binax Now,” is a compact credit card sized rapid test similar to a home pregnancy test.“You are receiving a nasal swab and then that swab is directly inserted into the card and there's a small pouch there that it's inserted into. Six drops of a buffer had been placed there prior to putting in the swab,” explained John Hackett, Junior Vice President of Applied Research and Technology at Abbott Laboratories.And though it does require a health care worker to administer, no specialty lab equipment is needed to process the antigen test. Results are available in about 15 minutes. The cost is apiece.“So, in 15 minutes you can look at the front of this test and if you see a single line, that would be the control line, and if there's two lines, that would indicate that the individual is positive for SARS-CoV-2,” said Hackett.The test was granted emergency use authorization by the FDA. It includes an app that allows people who test negative to display a temporary digital health pass for quick screening.The Trump administration quickly bought up 150 million tests for about 0 million.Officials say they are already beginning to deploy the tests to states, nursing homes, schools and areas hit hard by recent natural disasters.“These antigen tests however are fast and cheap, and it can be done really easily,” said Dr. Landon.Though, helpful in some scenarios, Landon cautions quick antigen tests like this can be less accurate and have a high false positive rate.“These tests aren't perfect and some of you have been in that situation with strep throat where you find that even if the test is negative that they send off a culture afterwards to make absolutely certain that you don't have strep throat and these tests are kind of similar,” she said.Still, experts say having a variety of testing options is beneficial. But the gold standard of accuracy remains the deep nasopharyngeal swab tests processed in a lab. 2796

  中山突然便血什么原因   

CAMPO, Calif. (KGTV) — Border Patrol agents this week discovered several packages of narcotics stuffed inside a vehicle's gas tank at an East County checkpoint.The agents stopped the vehicle at a Campo border checkpoint at about 1:30 p.m. on Thursday. During initial questioning, a K-9 officer inspecting the vehicle alerted agents to a possible narcotics.As the K-9 officer further inspected the vehicle, the canine directed agents toward the vehicle's gas tank. Agents say they discovered 53 cellophane packages floating in the gas tank, containing about 58.6 pounds of methamphetamine worth 4,780.The driver, a 47-year-old U.S. citizen, was arrested and the narcotics were turned over to Drug Enforcement Administration. As of Wednesday, Border Patrol officials say they seized more than 2,000 pounds of meth worth more than .6 million. 852

  中山突然便血什么原因   

CHICAGO, Ill. – A study published this month suggests that by lessening the amount of virus you take in by putting on a mask, you may also lessen the likelihood of getting severely sick if you contract COVID-19.As the race to a safe and effective coronavirus vaccine heats up, new research about masks is changing the narrative on their importance.Last week, CDC Director Dr. Robert Redfield called face masks the most “powerful public health tool we have.”“I might even go so far as to say that this face mask is more guaranteed to protect me against COVID than when I take a COVID vaccine,” said Dr. Redfield.It was a stark change from CDC messaging early on in the pandemic that face coverings would most likely only protect those around you.“That was because there was a lot of data at that time that you can shed the virus at high rates from your nose and mouth even when you feel well,” said Dr. Monica Gandhi, an infectious disease doctor and professor of medicine at the University of California – San Francisco.She co-authored newly published research in the New England Journal of Medicine that theorizes that not only do masks protect the wearer but they may even reduce the severity of the coronavirus when someone gets infected.“We realized that we should be messaging more strongly masks protect you as the wearer and protects others,” said Dr. Gandhi.It theoretically works much like the early days of vaccines that used small amounts of viruses to illicit an immune response in the body. So, by wearing a mask, you are only exposed to lesser amounts of the virus, if any, potentially building up a sort of immunity.“The more virus you get inside, the sicker you are, the less virus you have, the less sick you are. This is called a dose response and it's true of many infections,” said Dr. Emily Landon, an epidemiologist and infectious disease specialist at University of Chicago Medicine.Gandhi says the theory has already been studied and proven in animals.“There was a hamster study that looked at the COVID-19 virus and the more that the hamsters were given, the more sick they got,” she said.Dr. Gandhi says it could also explain the why according to the CDC, 40% of coronavirus patients are asymptomatic.“Countries that mask well have lower rates of severe illness than countries that don't mask well. So, putting it all together, this is our hypothesis.”And while the research is still theoretical, if it bears out, experts say universal mask-wearing could drive up the proportion of people who get less sick from the virus if they do contract it. 2579

  

CARLSBAD, Calif. (KGTV) — Police say they were tasked with breaking up a crowd of 50 to 100 beachgoers having a large party on Friday amid a ban on gatherings in the county due to the pandemic.Carlsbad Police say the large crowd of mostly young people was having a large party and drinking near the Rue Des Chateaux beach access point on North Ocean St. at about 6 p.m.Police said when they arrived, the crowd voluntarily dispersed and no fines were given.A witness who sent ABC 10News a photo of the scene said it's not the first time this has happened. The witness said that large gatherings and parties in their neighborhood and at the beach have become a daily occurrence. The county's public health order bans gatherings of any size involving individuals who are not from the same household. 804

  

Car buyers these days love SUVs. They don't, however, love actual cars like hatchbacks and sedans --as Ford has learned.Ford said on Wednesday the only passenger car models it plans to keep on the market in North America will be the Mustang and the upcoming Ford Focus Active, a crossover-like hatchback that's slated to debut in 2019.That means the Fiesta, Taurus, Fusion and the regular Focus will disappear in the United States and Canada.Ford will, however, continue to offer its full gamut of trucks, SUVs and crossovers.By 2020, "almost 90 percent of the Ford portfolio in North America will be trucks, utilities and commercial vehicles," the press release says. "The company is also exploring new 'white space' vehicle silhouettes that combine the best attributes of cars and utilities, such as higher ride height, space and versatility."By "white space," the company is referring to vehicles that don't fall neatly into the typical categories.Ford has hinted it might decide to retire much of its sedan portfolio. Earlier this year, James Farley, the company's president of global markets, said Ford is "shifting from cars to utilities," which have been a bigger profit driver. It also reallocated billion of research funds from cars to SUVs and trucks.And it's not just Ford. Fiat Chrysler did away with the Dodge Dart and Chrysler 200 more than a year ago. And General Motors decided to scale back production of the Chevy Cruze, Chevy Impala, Buick LaCrosse and the Cadillac ATS and CTS.  1514

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