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    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

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    3 Presumed Bird Flu Cases Reported in Colorado

    The cases, which have yet to be confirmed, were identified in farmworkers culling infected birds. The risk to the public remains low, health officials said.Three workers at a poultry farm in northeast Colorado have preliminarily tested positive for bird flu, according to state health officials.The workers had been culling birds from an infected population at the farm, the Colorado Department of Public Health and Environment said on Friday. All three workers had direct contact with infected birds and were experiencing mild symptoms, including conjunctivitis and “common respiratory infection symptoms,” the department said.The results are preliminary, and the tests have been sent to the Centers for Disease Control and Prevention for confirmation, the C.D.C. said.So far, four farmworkers in the United States have been infected with the virus, called H5N1, which is tied to a continuing outbreak among dairy cattle in several states.One case has been reported in Colorado, another in Texas and two more in Michigan, according to the C.D.C. All of those cases involved direct exposure to dairy cows, according to the state and federal health authorities, and officials have said that there is no evidence that the H5N1 virus spreads easily among humans.The risk to the public remains low, the C.D.C. said, but the agency added that it had sent a team to Colorado at the state’s request to help investigate.The C.D.C. said that it would look into whether workers were wearing personal protective equipment. Farmworkers are advised but not required to wear such equipment, including masks, safety goggles and gloves.“These preliminary results again underscore the risk of exposure to infected animals,” the C.D.C. said of the three new cases in Colorado. “There are no signs of unexpected increases in flu activity otherwise in Colorado, or in other states affected by H5 bird flu outbreaks in cows and poultry.”Avian influenza refers to a group of flu viruses primarily adapted to birds. The virus infecting farmworkers, H5N1, was first identified in 1996 in China and reported in people in 1997 in Hong Kong. A new form of H5N1, which surfaced in Europe in 2020, has rapidly spread around the world, and an outbreak in the United States has affected more than 99 million birds.The outbreak has been spreading among dairy farms since at least March, and 152 dairy herds in 12 states have tested positive for the virus. Scientists are researching how the virus is being transmitted through cows.The virus has also spread to a wide array of animals, including marine mammals like seals and bottlenose dolphins, skunks, squirrels and even domestic cats. More