The World Health Organization released guidelines on physical activity Wednesday, urging people to ward off sedentary lifestyles.
“You’ve taken two studies for which different doses were used and come up with a composite that doesn’t represent either of the doses," an expert said.
Earlier this month, Farah Khemili popped a wintergreen breath mint in her mouth and noticed a strange sensation: a bottom tooth wiggling against her tongue.Khemili, 43, of Voorheesville, New York, had never lost an adult tooth. She touched the tooth to confirm it was loose, initially thinking the problem might be the mint. The next day, the tooth flew out of her mouth and into her hand. There was neither blood nor pain.Khemili survived a bout with COVID-19 this spring, and has joined an online support group as she has endured a slew of symptoms experienced by many other "long haulers": brain fog, muscle aches and nerve pain.Sign up for The Morning 香港快遞查詢letter from the New York TimesThere's no rigorous evidence yet that the infection can lead to tooth loss or related problems. But among members of her support group, she found others who also described teeth falling out, as well as sensitive gums and teeth turning gray or chipping.She and other survivors unnerved by COVID's well-documented effects on the circulatory system, as well as symptoms such as swollen toes and hair loss, suspect a connection to tooth loss as well. But some dentists, citing a lack of data, are skeptical that COVID-19 alone could cause dental symptoms."It's extremely rare that teeth will literally fall out of their sockets," said Dr. David Okano, a periodontist at the University of Utah in Salt Lake City.But existing dental problems may worsen as a result of COVID-19, he added, especially as patients recover from the acute infections and contend with its long-term effects.And some experts say that doctors and dentists need to be open to such possibilities, especially because more than 47% of adults 30 years or older have some form of periodontal disease, including infections and inflammation of the gums and bone that surround teeth, according to a 2012 report from the Centers for Disease Control and Prevention."We are now beginning to examine some of the bewildering and sometimes disabling symptoms that patients are suffering months after they've recovered from COVID," including these accounts of dental issues and teeth loss, said Dr. William W. Li, president and medical director of the Angiogenesis Foundation, a nonprofit that studies the health and disease of blood vessels.While Khemili had become more diligent about her dental care, she had a history of dental issues before contracting the coronavirus. When she went to the dentist the day after her tooth came out, he found that her gums were not infected but she had significant bone loss from smoking. He referred Khemili to a specialist to handle a reconstruction. The dental procedure is likely to cost her just shy of $50,000.The same day Khemili's tooth fell out, her partner went on Survivor Corp, a Facebook page for people who have lived through COVID-19. There, he found that Diana Berrent, the page's founder, was reporting that her 12-year-old son had lost one of his adult teeth, months after he had a mild case of COVID-19. (Unlike Khemili, Berrent's son had normal and healthy teeth with no underlying disease, according to his orthodontist.)Others in the Facebook group have posted about teeth falling out without bleeding. One woman lost a tooth while eating ice cream. Eileen Luciano of Edison, New Jersey, had a top molar pop out in early November when she was flossing."That was the last thing that I thought would happen, that my teeth would fall out," Luciano said.Teeth falling out without any blood is unusual, Li said, and provides a clue that there might be something going on with the blood vessels in the gums.The new coronavirus wreaks havoc by binding to the ACE2 protein, which is ubiquitous in the human body. Not only is it found in the lungs, but also on nerve and endothelial cells. Therefore, Li said, it's possible that the virus has damaged the blood vessels that keep the teeth alive in COVID-19 survivors; that also may explain why those who have lost their teeth feel no pain.It's also possible that the widespread immune response, known as a cytokine storm, may be manifesting in the mouth."If a COVID long hauler's reaction is in the mouth, it's a defense mechanism against the virus," said Dr. Michael Scherer, a prosthodontist in Sonora, California. Other inflammatory health conditions, such as cardiovascular disease and diabetes, he said, also correlate with gum disease in the same patients."Gum disease is very sensitive to hyper-inflammatory reactions, and COVID long haulers certainly fall into that category," Scherer said.Dentists haven't seen many of these cases, and some dismiss these individual claims. But physicians like Li say COVID-19's surprises require that the profession be on the lookout for unexpected consequences of the disease."Patients may be bringing in new findings," he said, and physicians and dentists need to cooperate on understanding the effects of long-term COVID-19 on teeth.For now, Khemili hopes her story may serve as a cautionary tale. If people aren't taking the proper precautions to protect themselves from the coronavirus, "they could be looking at something like this."This article originally appeared in The New York Times.(C) 2020 The New York Times Company
NEW RESEARCH SHOWS ADDING A FILTER AND IMPROVING THE FIT MAKES A CLOTH MASK WORK EVEN BETTER.Is it time to upgrade your mask?By now most of us have settled on a preferred cloth mask to protect ourselves and others from coronavirus. But new research shows that a few simple upgrades in fabric, filters and fit are likely to provide even more protection.Sign up for The Morning 香港快遞查詢letter from the New York TimesLinsey Marr, professor of civil and environmental engineering at Virginia Tech and one of the world's leading aerosol scientists, led the research, which tested 11 different mask materials. The findings confirmed what other labs have found: You don't need a gold-standard N95 medical mask to stay safe from coronavirus. The right cloth mask, properly fitted, does a good job of filtering viral particles of the size most likely to cause infection.But Marr and her colleagues found that small improvements to your mask can go a long way toward improving how well the mask protects you and others from potential infectious particles. They found that:-- THREE LAYERS ARE BETTER THAN TWO: The best mask has two tightly woven layers of outer material with a filter material sandwiched in the middle, Marr said. You can use surgical mask material or even a piece of a vacuum bag as a filter between two pieces of fabric. Coffee filters are an option, but can be less breathable. If you like your two-layer mask, you can just wear it over a surgical mask when you want added protection. A well-fitting fabric mask with a third filter layer can stop 74% to 90% of risky particles, the researchers found.-- FLEXIBLE MATERIAL IS BETTER: Stiff material creates gaps. Look for a mask made of tightly woven flexible material that contours to your face. Masks with wire that can be molded around the nose also fit better by closing gaps where air can escape out and seep in.-- TIES ARE BETTER THAN EAR LOOPS: Masks that tie around your head fit better and can be more comfortable. Ear loop masks can leave bigger gaps around your face and cause ears to become sore with longer use.-- FACE SHIELDS SHOULD BE USED WITH A MASK: Face shields alone offered little to no protection. Although the clear plastic shield is impermeable, air seeps out and comes in around the edges of the shield. "It was the worst of everything," said Jin Pan, a civil and environmental engineering Ph.D. student who was a co-author of the study. A face shield combined with a mask offers added protection, particularly for the eyes.-- A WELL-FITTED MASK PROTECTS THE WEARER: Marr and her colleagues tested cloth masks for how well they protected others (outward protection) as well as the wearer (inward protection). Although masks are most efficient at filtering outgoing germs, they do stop incoming germs at nearly the same rate in most cases, the researchers found. Masks that did a poor job protecting the wearer were those made of stiffer materials and those worn loosely and with gaps around the edges.A recent study from Denmark suggested that masks don't protect the wearer, but Marr noted that in that study, many people weren't using masks properly. "Fewer than half wore them as instructed," Marr said. Although Marr's findings come from a lab, rather than the real world, she said her group's latest research should offer reassurance to people who wear well-fitted masks that they are getting additional protection from other people's germs.The research should also reassure people about the benefits of cloth masks, Marr said. She noted that masks can't do "100% of the work," and it's important to combine mask wearing with other measures, like hand-washing and restricting social contacts."Something is better than nothing," Marr said. "Even the simplest cloth mask of one layer of material blocks half or more of aerosols we think are important to transmission. If you go to a tighter weave and more layers, you'll get even better performance."The Virginia Tech study was published online and has not yet been peer reviewed.This article originally appeared in The New York Times.(C) 2020 The New York Times Company
“Donald Trump defeated Donald Trump.”
“The victory was a vindication of a style of American politics that many feared was gone forever.”
“Mr. Biden’s victory — and Mr. Trump’s defeat — is a testament to the resilience of American democracy.”
“Trump’s 2020 reelection bid was doomed by his boorish behavior. Time and again, he refused to act like a president.”
“Biden took the opportunity to unite the Democratic Party.”