More stories

  • in

    How a Crisis for Vultures Led to a Human Disaster: Half a Million Deaths

    The birds were accidentally poisoned in India. New research on what happened next shows how wildlife collapse can be deadly for people.To say that vultures are underappreciated would be putting it mildly. With their diet of carrion and their featherless heads, the birds are often viewed with disgust. But they have long provided a critical cleaning service by devouring the dead.Now, economists have put an excruciating figure on just how vital they can be: The sudden near-disappearance of vultures in India about two decades ago led to more than half a million excess human deaths over five years, according to a forthcoming study in the American Economic Review.Rotting livestock carcasses, no longer picked to the bones by vultures, polluted waterways and fed an increase in feral dogs, which can carry rabies. It was “a really huge negative sanitation shock,” said Anant Sudarshan, one of the study’s authors and an economics professor at the University of Warwick in England.The findings reveal the unintended consequences that can occur from the collapse of wildlife, especially animals known as keystone species for the outsize roles they play in their ecosystems. Increasingly, economists are seeking to measure such impacts.A study looking at the United States, for example, has suggested that the loss of ash trees to the invasive emerald ash borer increased deaths related to cardiovascular and respiratory illness. And in Wisconsin, researchers found that the presence of wolves reduced vehicle collisions with deer by about a quarter, creating an economic benefit that was 63 times greater than the cost of wolves killing livestock.“Biodiversity and ecosystem functioning do matter to human beings,” said Eyal Frank, an economist at the University of Chicago and one of the authors of the new vulture study. “And it’s not always the charismatic and fuzzy species.”We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

  • in

    Why Your Covid Symptoms Could Feel Different This Time

    Cases are rising across the United States. Here’s what to know about how symptoms of an infection can shift.By this point in the Covid-19 pandemic, most people have had at least one brush with the virus. Those of us who have been infected again (and again) may think we know the drill.But symptoms can vary from one infection to the next. The virus has felt like an entirely different illness each time I’ve tested positive: The first go-round, a fever flattened me. Once, I had barely any symptoms. The worst infection left me wrung-out on my couch, so exhausted I had to strain to pay attention to a podcast.“No two Covid infections really have behaved the same,” said Dr. Joseph Khabbaza, a pulmonary and critical care doctor at Cleveland Clinic.Generally speaking, the more immunity people build up from vaccination or infections, the milder symptoms of subsequent infections tend to be. But for an individual, there is no guarantee that a second infection will be less severe than the first.That’s partly because the virus has changed, developing into new variants. If you’re reinfected, that means the virus has evolved enough to slip past your immune defenses, said Dr. Davey Smith, an infectious disease specialist at the University of California, San Diego.Many Covid symptoms have stayed the same since 2020: fever, sore throat, coughing. But some have shifted. It used to be common for people to lose their sense of taste and smell when they got sick, for example, but that now seems to happen less frequently. Early in the pandemic, Dr. Khabbaza said, patients would tell him that their Covid infections felt like nothing they had experienced before. Now, he said, people often think they have a cold, and are shocked when they test positive.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

  • in

    A Summer Guide to Covid Testing, Symptoms and Treatment

    Experts say cases could rise in the coming weeks. Here’s what to know about symptoms, testing and treatment.As the so-called “FLiRT” variants of the coronavirus continue to gain traction, doctors and researchers are bracing for a potential rise in cases this summer. KP.2, one of these variants, now accounts for 28.5 percent of cases, and data from the Centers for Disease Control and Prevention shows a small increase in Covid-related emergency room visits and positive tests.Here’s what to know about symptoms, testing and treatment if you do fall ill:Symptoms to watch out forThere’s no evidence that symptoms of the FLiRT variants and other recent strains are any different, said Aubree Gordon, an infectious disease epidemiologist at the University of Michigan.The symptoms still include sneezing, congestion, headaches, sore muscles, nausea or vomiting. Many people also report exhaustion and a general “blah” feeling.In general, the more immunity you’ve built up from vaccination or past infections, the milder your next bout with the virus is likely to be. (Though it’s possible to experience more intense symptoms with a new infection than you’ve had in past Covid cases.)The symptoms of Covid can look similar to those caused by allergies or other infections. The best way to tell the difference is to test.When (and how) to testIn an ideal world, experts said, people would take a Covid test as soon as they develop symptoms or learn they were exposed, and then test again a day or two later. But if you only have a limited number of at-home rapid tests, there are a few ways to maximize their usefulness: Test immediately if you have a fever and a cough, said Dr. Davey Smith, an infectious disease specialist at the University of California, San Diego.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

  • in

    Younger Adults Are Missing Early Warning Signs of Colon Cancer

    The LatestColorectal cancer rates are rapidly rising among adults in their 20s, 30s and 40s, and the most common warning sign for the disease is passing blood in the stool, according to a new scientific review.Rectal bleeding is associated with a fivefold increased risk of colorectal cancer, according to the new analysis, which looked at 81 studies that included nearly 25 million adults under 50 from around the world.Abdominal pain, changes in bowel habits and anemia are other common warning signs of the disease and should not be ignored, said the researchers, who published the paper on Thursday in the journal JAMA Network Open.A light micrograph of a colon biopsy from a colonoscopy.Choksawatdikorn/Science SourceWhy It MattersColon and rectal cancer rates have risen among younger adults as rates have declined among older people, who are far more likely to get colonoscopies that can catch cancers and precancerous lesions called polyps.But though millennials born around 1990 are at almost twice the risk of colon cancer compared with people born in the 1950s, and have a risk of rectal cancer that is four times as high, young people without a strong family history of colon cancer aren’t eligible for colonoscopies until the age of 45.Doctors may also miss the warning signs. Anecdotal evidence suggests that because physicians are less likely to suspect malignancies in younger people, they may attribute a symptom like rectal bleeding to a benign condition like hemorrhoids, rather than cancer, said Joshua Demb, a cancer epidemiologist at the University of California, San Diego, and one of the paper’s lead authors.From the time younger adults first go to a caregiver with a complaint about a symptom until they receive a diagnosis can take four to six months on average, the analysis found. Because the diagnosis is often delayed, younger adults tend to have more advanced disease that is harder to treat.“We need to facilitate early detection, and one way is identifying these red flags,” Dr. Demb said.What We Don’t KnowThe causal factors driving the rise in colon and rectal cancers in younger adults were not addressed in the new analysis, and are not well understood.Colorectal cancer has long been associated with obesity, smoking, a sedentary lifestyle, high alcohol intake and diets that are rich in red meat, processed food and sugary drinks.New research exploring the rapid rise in colorectal cancer in younger adults is examining other possible causes, including environmental exposures, changes in gut bacteria and the use of some medications, such as antibiotics. More

  • in

    The Disease Detectives Trying to Keep the World Safe From Bird Flu

    As Dr. Sreyleak Luch drove to work the morning of Feb. 8, through busy sunbaked streets in Cambodia’s Mekong river delta, she played the overnight voice messages from her team. The condition of a 9-year-old boy she had been caring for had deteriorated sharply, and he had been intubated, one doctor reported. What, she wondered, could make the child so sick, so fast?“And then I just thought: H5N1,” she recalled. “It could be bird flu.”When she arrived at the airy yellow children’s ward at the provincial hospital in Kratie, she immediately asked the child’s father if the family had had contact with any sick or dead poultry. He admitted that their rooster had been found dead a few days before and that the family had eaten it.Dr. Luch told her colleagues her theory. Their responses ranged from dubious to incredulous: A human case of avian influenza had never been reported in their part of eastern Cambodia. They warned her that if she set off the bird flu warning system, many senior government officials might get involved. She risked looking foolish, or worse.Anxious but increasingly certain, Dr. Luch phoned the local public health department, located just across the street. Within minutes, a team arrived to collect a sample from the child, Virun Roeurn, for testing in a lab.By then, Virun’s distraught parents had lost faith in the hospital. They demanded that he be sent by ambulance to the capital, Phnom Penh. His flu swab sample traveled with him.Virun died on the journey. At 8 p.m., Cambodia’s National Public Health Laboratory confirmed Dr. Luch’s suspicion: He had died of highly pathogenic avian influenza.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

  • in

    What to Know About New Covid Variants, ‘FLiRT’: Symptoms, Vaccines and More

    Experts are closely watching KP.2, now the leading variant.For most of this year, the JN.1 variant of the coronavirus accounted for an overwhelming majority of Covid cases. But now, an offshoot variant called KP.2 is taking off. The variant, which made up just one percent of cases in the United States in mid-March, now makes up over a quarter.KP.2 belongs to a subset of Covid variants that scientists have cheekily nicknamed “FLiRT,” drawn from the letters in the names of their mutations. They are descendants of JN.1, and KP.2 is “very, very close” to JN.1, said Dr. David Ho, a virologist at Columbia University. But Dr. Ho has conducted early lab tests in cells that suggest that slight differences in KP.2’s spike protein might make it better at evading our immune defenses and slightly more infectious than JN.1.While cases currently don’t appear to be on the rise, researchers and physicians are closely watching whether the variant will drive a summer surge.“I don’t think anybody’s expecting things to change abruptly, necessarily,” said Dr. Marc Sala, co-director of the Northwestern Medicine Comprehensive Covid-19 Center in Chicago. But KP.2 will most likely “be our new norm,’” he said. Here’s what to know.The current spread of CovidExperts said it would take several weeks to see whether KP.2 might lead to a rise in Covid cases, and noted that we have only a limited understanding of how the virus is spreading. Since the public health emergency ended, there is less robust data available on cases, and doctors said fewer people were using Covid tests.But what we do know is reassuring: Despite the shift in variants, data from the C.D.C. suggests there are only “minimal” levels of the virus circulating in wastewater nationally, and emergency department visits and hospitalizations fell between early March and late April.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

  • in

    Complications from Alcohol Use Are Rising Among Women

    New research shows that alcohol-related liver disease and other health problems increased even more than expected among women ages 40 to 64 during the pandemic.The LatestA new study adds to a mounting body of evidence showing that rising alcohol consumption among women is leading to higher rates of death and disease. The report, published Friday in the journal JAMA Health Forum, examined insurance claims data from 2017 to 2021 on more than 14 million Americans ages 15 and older. Researchers found that during the first year and a half of the coronavirus pandemic, women ages 40 to 64 were significantly more likely than expected to experience serious complications like alcohol-related cardiovascular and liver disease, as well as severe withdrawal.The BackgroundAlcohol consumption in the United States has generally increased over the last 20 years, said Dr. Timothy Naimi, the director of the Canadian Institute for Substance Use Research at the University of Victoria. Dr. Naimi was a co-author on a recent paper that showed deaths from excessive alcohol use in the United States rose by nearly 30 percent between 2016 and 2021.While men still die more often from drinking-related causes than women, deaths among women are climbing at a faster rate. “The gap is narrowing,” said Dr. Bryant Shuey, an assistant professor of medicine at the University of Pittsburgh and the lead author of the new study.The ResearchThe study looked at serious health issues related to drinking, including alcohol-related liver and heart disease, inflammation of the stomach lining that led to bleeding, pancreatitis, alcohol-related mood disorders and withdrawal. Researchers compared insurance claims data for these complications with the rates they expected to see based on past prevalence of these conditions.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

  • in

    Amid Florida’s Measles Outbreak, Surgeon General Goes Against Medical Guidance

    In a letter, Joseph Ladapo said parents at an elementary school with confirmed measles cases can decide whether their children should attend school.As a cluster of measles cases grew in an elementary school in southern Florida, the state’s surgeon general sent a letter to parents that contradicted widespread medical guidance about how to keep the disease from spreading.Doctors and health officials typically recommend that children who are not vaccinated for measles isolate for 21 days after they have been exposed at school. In the letter, the state surgeon general, Dr. Joseph Ladapo, said it was up to parents and guardians to determine when their children can attend school, even if those children have not been vaccinated against the disease.“Because of the high likelihood of infection, it is normally recommended that children stay home until the end of the infectious period,” the letter read. However, the state Department of Health “is deferring to parents or guardians to make decisions about school attendance,” the letter, sent to parents at Manatee Bay Elementary School in Weston, Fla., continued.Dr. Ladapo added that these recommendations might change in the future and stressed that children with measles symptoms should not go to school. As of Friday, there were six confirmed cases at the school, according to Broward County Public Schools.Measles is one of the world’s most infectious diseases. Cases and deaths have been rising across the globe, in part because health officials have struggled to vaccinate people in the wake of the coronavirus pandemic and growing vaccine hesitancy. In January, the Centers for Disease Control and Prevention warned physicians to “stay alert for measles” as more cases emerged in the United States, largely among unvaccinated children and adolescents.Dr. Ladapo, a former clinical researcher at the University of California, Los Angeles, has played a prominent role in the administration of Gov. Ron DeSantis, a Republican, appearing with the governor at events that mainstream public health experts have repeatedly criticized as spreading dangerous falsehoods.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More