A suspected case of bird flu in a farm worker in the Brazilian city of Montenegro came back negative, the health ministry of Rio Grande do Sul, the country's southernmost state, said in a statement on Tuesday.

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.

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.