Brazil is still analyzing a new suspected case of bird flu on a commercial poultry farm, raising concerns the deadly virus may be spreading in the world’s largest chicken exporter.

Brazil, one of the world’s largest producers and exporters of poultry, has confirmed the country’s first bird flu outbreak on a commercial farm.

A devastating U.S. bird flu outbreak and wider trade tensions with Washington have limited Chinese appetite for American poultry. China now blocks poultry from more than 40 U.S. states over bird flu, according to U.S. government data.