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Experts warn bird flu virus changing rapidly in largest ever outbreak

Since first emerging in 1996, the #H5N1 #avian #influenza #virus had previously been confined to mostly seasonal outbreaks.

But "something happened" in mid-2021 that made the group of viruses much more infectious, according to Richard Webby, the head of a World Health Organization collaborating centre studying influenza in animals.

Since then, outbreaks have lasted all year round, spreading to new areas and leading to mass deaths among wild birds and tens of millions of poultry being culled.

Webby, who is a researcher at St Jude Children's Research Hospital in the US city of Memphis, told AFP it was "absolutely" the largest outbreak of avian influenza the world had seen.

He led research, published this week in the journal Nature Communications, showing how the virus rapidly evolved as it spread from Europe into North America.

The study said the virus increased in virulence, which means it causes more dangerous disease, when in arrived in North America.

The researchers also infected a ferret with one of the new strains of bird flu.

The found an unexpectedly "huge" amount of the virus in its brain, Webby said, indicating it had caused more serious disease than previous strains.

Emphasising that the risk in humans was still low, he said that "this virus is not being static, it's changing".

"That does increase the potential that even just by chance" the virus could "pick up genetic traits that allow it to be more of a human virus," he said.

In rare cases, humans have contracted the sometimes deadly virus, usually after coming in close contact with infected birds.

The virus has also been detected in a soaring number of #mammals, which Webby described as a "really, really troubling sign".

Last week Chile said that nearly 9,000 sea lions, penguins, otters, porpoises and dolphins have died from bird flu along its north coast since the start of the year.

Most mammals are believed to have contracted the virus by eating an infected bird.

But Webby said that what "scares us the most" are indications from a Spanish mink farm, or among sea lions off South America, that the virus could be transmitting #between mammals

rfi.fr/en/health-and-lifestyle

RFIExperts warn bird flu virus changing rapidly in largest ever outbreakBy RFI

#Vss365 (#Gardener's version)

In 1812, the Brothers #Grimm told of #Folklore's Frau #Berchta, an #Alpine #Goddess.

The 5 #Petals of the #White #Christmas #Rose (#Helleborus niger) #Bloomed #Iridescent in her tracks. Berchta means #Luminous.

Niger refers to the #Black #Roots which were used to make a #Poultice during the #BlackPlague.

Berchta visited homes #Between #Christmas & #TwelfthNight to #Bless #Good children w/ #Gold coins & #Punish the #Naughty by stuffing their #Stomach-s w/ straw.