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 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.