Hundreds of songbirds are dying from a mysterious illness that causes strange neurological behavior and experts have no idea why

A small brown bird with a crusty layer over its eyes.
A bird found in Washington DC with swollen, crusty eyes, a common symptom of the strange illness.

  • A mystery illness has killed hundreds of songbirds in several US states.
  • It also causes the birds to act strangely, and lose some control of their limbs.
  • Scientists are testing for viruses, bacteria, and chemicals, but the cause is still unknown.
  • See more stories on Insider’s business page.

Hundreds of songbirds across at least eight US states are dying from a mysterious illness with strange symptoms, but experts have no idea what’s causing it.

The US Geological Survey said on June 9 that sick and dying birds were being reported in several US states, with neurological symptoms and some physical complications that include eye swelling and crusty discharge.

Birds with these symptoms have now been reported in Indiana, Ohio, Kentucky, Washington DC, Pennsylvania, Delaware, West Virginia, Virginia, and Maryland. Allisyn Gillet, an ornithologist with the Indiana Department of Natural Resources, said a large variety of songbirds are dying from the unknown illness.

“We need to figure out what makes this disease be able to affect all these different species,” she told Insider, “and why is it in all these different states.”

The affected species include those that are typically seen in backyards – common grackles, blue jays, European starlings, American robins, and cardinals, among others.

It’s ‘as if they didn’t have any control over their head’

Gillet said they realized something was going on when a local wildlife rehabilitation center in the state started taking in birds with the same combination of peculiar symptoms. The birds had eye swelling, crustiness, and discharge, to the extent that it hindered their ability to see.

The birds were also disoriented and exhibiting unusual behaviors, including walking in strange ways and stumbling around. They had little control of their limbs and would do things like kick their legs up while on their backs.

“They would sway their heads in strange ways, as if they didn’t have any control over their head,” Gillet said.

People were reporting the birds seemed oddly unafraid of people, but Gillet said they were likely just too blinded or disoriented to react. She said the mortality rate of the illness appears high, as most of the birds are dead shortly after they are reported to officials. There have been 280 confirmed bird deaths with these symptoms in Indiana alone, according to Gillet.

Diagnostic labs are testing the bird specimens for viruses and bacteria, and are conducting toxicology testing for chemicals. They have been able to rule out avian influenza and West Nile virus, but not much else.

“They haven’t come to any conclusion. There are no definitive results right now,” Gillet said.

One possible factor being explored is the recent brood of cicadas throughout the eastern US. The emergence of the cicadas aligns with the timing and range of the bird illness. Gillet said there’s a correlation there, but a link has not yet been established.

Taking down bird feeders and baths helps the birds ‘socially distance’

In the meantime, officials in the impacted states are recommending citizens take down their bird feeders and bird baths, things that encourage birds to congregate.

“We want them to socially distance,” Gillet explained. “We don’t know enough, so we have to take the proper precautions.”

She also recommended reporting instances of birds displaying these symptoms to local wildlife authorities. Some states, like Kentucky and Indiana, have online wildlife disease reporting systems where citizens can upload photos or videos of the afflicted bird.

Gillet said the illness is especially unfortunate given that birds in North America already face many threats, such as habitat loss, window collisions, and natural predators with inflated populations.

A study published in the journal Science in 2019 found 3 billion birds have vanished from North America since 1970, and that even common species are experiencing declines.

“It’s unfortunate that there has to be another thing that is affecting their populations negatively,” Gillet said.

Have a news tip? Contact this reporter at kvlamis@insider.com.

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The coronavirus likely traveled 800 miles to Wuhan from farms that breed wild animals for food, a WHO report found

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The Wuhan Huanan Wholesale Seafood Market, a site of one of the first COVID-19 super-spreader events, sits closed on January 21, 2020.

After a month-long investigation in Wuhan, the World Health Organization has offered its best guess as to where the coronavirus came from and how it got into the human population.

A 120-page report released Tuesday lists the virus’ potential origin scenarios in order of their likelihood. At the top is the possibility that the coronavirus jumped from bats to people via an intermediary animal host. But the WHO team, which visited Wuhan from January to February, was in the end unable to pinpoint which population of bats, or which intermediary species, was carrying the virus.

The group did, however, determine that the cross-species hop most likely happened at a farm where wild animals were bred for food in southern China.

“They take exotic animals, like civets, porcupines, pangolins, raccoon dogs, and bamboo rats, and they breed them in captivity,” Peter Daszak, a disease ecologist and member of the WHO team, told NPR.

The WHO team thinks that spillover event, as its known, happened in November or even October 2019. China shut down these types of wildlife farms in February 2020, Daszak said.

‘There is a pathway that this virus could’ve taken’

china rabbit farm
A farmer checks rabbits at his farm in Chongqing, China, January 29, 2021.

Daszak said his team found evidence that wildlife farms in China’s Yunnan province and surrounding provinces supplied vendors at the Huanan Seafood Wholesale Market in Wuhan. The first cluster of COVID-19 cases reported in December was linked to that market, which sold live animals and frozen meat.

Two studies published last year found that the new coronavirus shares 96% and 97.1% of its genetic code with coronaviruses seen in Chinese horseshoe bat populations from the Yunnan province, which borders Laos, Myanmar, and Vietnam.

“Animals that we know are coronavirus reservoirs or able to carry coronaviruses came from places where the nearest related viruses are found,” Daszak said Tuesday in a WHO press conference. “There is a pathway that this virus could’ve taken to move 800 to 1,000 miles from the rural parts of south China, southeast Asia, to this market.”

According to the WHO report, possible intermediary host species that may have been raised at these wildlife farms include: minks, pangolins, rabbits, raccoon dogs, and domesticated cats. All of these species can be infected by the new coronavirus. The team is also considering civets, ferret badgers, and weasels as potential hosts, since these animals got infected with the SARS coronavirus and passed it to people in 2002.

china mink
A woman carrying mink furs walks at an open air market in China’s Hebei province, November 19, 2020.

Any contact with an infected animal, or with animal products or poop, can allow a virus to jump from animals to people.

But the WHO team didn’t find any infected animals

Daszak’s group took 900 samples from the Huanan market, which closed in early January 2020. They swabbed surfaces, examined animal carcasses, and tested sewage, looking for evidence of the virus. The results showed the surfaces were indeed contaminated with viral particles, but none of the animal carcasses studied – or live animals brought to the site – tested positive.

This suggests that humans, not animals, most likely brought the virus into the market. Indeed, the WHO team concluded the virus had been circulating in Wuhan for a month or more before the outbreak there.

In this photo taken June 11, 2020, and released by CBCGDF, Sophia Zhang, a staffer from China Biodiversity Conservation and Green Development Foundation, or CBCGDF, collects oral and nasal secretion sample for testing from the Pangolin named Lijin at the Jinhua wild animal rescue center in eastern China's Zhejiang province. (CBCGDF via AP)
A staff member collects samples for testing from a pangolin at the Jinhua wild animal rescue center in China’s Zhejiang province, June 11, 2020.

The WHO team also examined more than 80,000 samples from cattle, sheep, chickens, ducks, geese, and pigs from 31 provinces across China. There wasn’t a single positive case among them. None of the animals had coronavirus-specific antibodies, either, which would have indicated a past infection.

The researchers weren’t able to test animals at wildlife in farms from southern China for evidence of infection, however, so they recommended doing so in a follow-up investigation.

Finding the bat population that first harbored the virus may be easier

horseshoe bat
A greater horseshoe bat, a relative of the Rhinolophis sinicus species that was the original host of the SARS virus.

According to Fabian Leendertz, a wildlife veterinarian with the WHO team, it’s more likely that the team will find the bat population the virus first lived in, rather than the animal that passed it to humans.

“At this point, it may well have disappeared from any intermediate host, so sampling bats, in particular, is probably the most likely to yield results,” Leendertz told Science.

Bats are common virus hosts: Cross-species hops from bat populations also led to the outbreaks of Ebola, SARS, and the Nipah virus.

Still, the WHO team tested samples from more than 1,100 bats in the Hubei province, where Wuhan is located, and did not see any viruses closely related to the new coronavirus. That non-finding lends credence to the idea that the virus first jumped to people elsewhere in China.

Daszak is still confident, however, that scientists will eventually find the population of bats that were the coronavirus’ original hosts.

“It would’ve been incredible to have a bat with the exact same lineage of viruses,” he said. “We didn’t see that yet. That will come in the future I think.”

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