The outbreak has killed millions of birds and half a billion poultry. Increasing cases in mammals – from cattle to polar bears – has WHO worried.
Australia is the last continent free from a virulent strain of bird flu that has killed an unprecedented number of animals, led to the culling of half a billion poultry birds and sparked “enormous concern” within the World Health Organisation about a leap into humans, after a Texan man fell ill with the virus.
A bald eagle that tested positive to avian influenza receives treatment at rehabilitation centre in Milwaukee.Clade 2.3.4.4b probably emerged in this way in 2021 and now the world is in the grip of a bird flu panzootic – an animal pandemic.of South American beaches littered with the bodies of 17,400 elephant seal pups. The virus has killed polar and grizzly bears, decimated Peruvian pelican populations and infected bottlenose dolphins, lions and skunks.
“These viruses seem to now be jumping into mammals and back into birds, which we haven’t really seen before,” Ward said. “The more often that happens, the more likely it is that at some point, these viruses are going to start picking up undesirable characteristics that then would allow them to transmit from human to human. The cattle example in the US is sort of going down that path.
Avian flu jumped into cattle for the first time in Texas earlier this year and may have been spreading from cow to cow.Infection in pigs could be particularly dangerous because they’re “mixing vessels” that can catch strains of human and bird flu, Ward said. The virus may have spread between cows through unsterilised milking equipment or feed, not in an airborne manner like COVID-19, limiting its potential to take off as a human pandemic.
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