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The H5N1 bird flu virus strain has been detected in very high concentrations in raw milk from infected animals, the WHO said on Friday (Apr 19), though how long the virus can survive in milk is unknown. Avian influenza A (H5N1) first emerged in 1996 but since 2020, the number of outbreaks in birds has grown exponentially, alongside an increase in the number of infected mammals. The strain has led to the deaths of tens of millions of poultry, with wild birds and land and marine mammals also infected. Cows and goats joined the list last month - a surprising development for experts because they were not thought to be susceptible to this type of influenza. US authorities earlier this month said a person working on a dairy farm in Texas was recovering from bird flu after being exposed to cattle. "The case in Texas is the first case of a human infected by avian influenza by a cow," said Wenqing Zhang, head of the global influenza programme at the World Health Organization. "Bird-to-cow, cow-to-cow and cow-to-bird transmission have also been registered during these current outbreaks, which suggest that the virus may have found other routes of transition than we previously understood," she told a media briefing in Geneva.
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