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How Humanity Unleashed a Flood of New Diseases

The New York Times – What do Covid-19, Ebola, Lyme and AIDS have in common? They jumped to humans from animals after we started destroying habitats and ruining ecosystems. “…There is much we don’t know about the origins of the ongoing pandemic and some details that we may never learn. Though genetic sequencing currently indicates that horseshoe bats are the ultimate source of SARS-CoV-2, it’s possible another animal will eventually prove to be the vector. Bats may have initially infected livestock or more exotic captive creatures raised on one of China’s many wildlife farms. Perhaps the bats (or another vector) were smuggled across the southern border from a neighboring country, like Myanmar or Vietnam. Or maybe the virus was intermittently infecting animals and people in rural areas for years before finally finding a route to a major city. Regardless of SARS-CoV-2’s precise trajectory, experts agree that Covid-19 is a zoonosis, a disease that jumped from animals to humans. Between 60 and 75 percent of emerging infectious diseases in humans come from other animals. Many zoonoses — rabies, Lyme, anthrax, mad cow disease, SARS, Ebola, West Nile, Zika — loom large in public consciousness; others are less familiar: Q fever, orf, Rift Valley fever, Kyasanur Forest disease. More than a few, including influenza, AIDS and the bubonic plague, have caused some of the deadliest outbreaks in recorded history. Although zoonoses are ancient, thought to be referenced in Mesopotamian tablets and the Bible, their numbers have increased in the last few decades, along with the frequency of outbreaks…”

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