Covid spreads from animals to humans. Now it’s spilling back


By then, five more EU countries, including Canada, had sued mink farms – but they were no longer the only affected areas. In August, there was a coronavirus Marked They had 10,000 minutes on the ranch in Utah and between October Died. By December, the virus had also attacked farms in Michigan, Oregon and Wisconsin. (Unlike in Europe, American fur producers did not kill their mink))

The original spillover was the initial transfer from bat to mystery creature to humans. The Spillback In a different way, it has evolved from humans to animals – among the thousands of members of different species that have given way to adapting to the virus before. Many mink, living near the edge, can provide a huge opportunity to transform the Stork-Cavi-2 in an unpredictable way. That possibility was confirmed late last year. A viral form in Danish mink Appeared Never before had there been a cluster of such mutated mutations, such mutations were able to neutralize the antibodies and avoid some of the resistance given.

Spillbacks are inherently alarming, but if a virus returns to an animal population and does not spread further, it may not pose a threat to public health. An investigation in the Netherlands last summer Found Based on genomic analysis, a small number of farm workers carry a version of the virus that has clearly passed through the minik. Emphasis by minics, captivity and crowds on these farms can be uniquely risky for the virus and so they and their handlers can create a unique hotspot together. It estimates, two European health agencies Recommended Earlier this month, farms and farm workers on the farms continued to conduct frequent tests to see which viruses could be infected on the farm.

But what if the virus is a confined species and does not become a wild member or other relative of that species without being in its handler? This scenario traps veterinarians and public health officials and may even be effective.

In December, the USDA Found A wild mink virus from Utah that was trapped near an animal farm. Presumably, it acquired the virus through contact with farm brokers, or with farm debris, or even in contact with an escaped animal; USDA officials said no other wildlife had been trapped in the area and had not been tested for the virus. However, other wild species are more likely to get the virus Trouble Scientist. These include minks (such as ferrets), other animals of the same family (such as whistles or otters) or even non-related ones.

“We have to be very concerned about this, and only it can create an alternative reservoir that could be a source for humans,” said Raina Plowert, a pathologist and veterinarian at Montana State University. “In each reservoir, different selective pressures are being exerted on the pathogen, so the virus will evolve in different ways to overcome any impediments that exist in this species. If we start transmitting coronaviruses to different species, some of which have different genotypes, we are also more likely to develop new coronaviruses that are different than the current ones in that they can avoid vaccine-prone immunity. “

These alternative hosts could be bats, the seemingly real home of coronaviruses. Last September, a team of researchers from several institutions Approximate About 40 species of North American bats can be susceptible to infection and act as viral reservoirs. It could also mean inhumane primates: Johnson, whose NIH-funded project works in South America, expressed concern about potential viral traffic between humans and forest-friendly monkeys.



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