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Brazil, the world's largest chicken exporter, confirmed its first outbreak of bird flu on a poultry farm on Friday.
The outbreak occurred in the city of Montenegro in Brazil's southernmost state of Rio Grande do Sul, the farm ministry said.
Two people familiar with the matter said it was identified at a farm supplying Vibra Foods, a Brazilian operation backed by Tyson Foods.
Vibra and Tyson did not immediately respond to questions.
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Vibra has 15 plants in Brazil and exports to over 60 countries, according to its website.
The announcement of the outbreak triggered a country-wide trade ban from China and state-wide restrictions for other major consumers.
Brazil's Agriculture Minister Carlos Favaro said on Friday that China's ban was set to last 60 days.
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Brazil exported $10 billion of chicken meat in 2024, accounting for about 35% of global trade.
Much of that came from meat processors BRF and JBS, which ship to some 150 countries.
China, Japan, Saudi Arabia and the United Arab Emirates are among the main importers.
Veterinary officials are isolating the area of the outbreak in Montenegro and hunting for more cases, the state agricultural secretariat said.