Officials and chicken farmers in Brazil have stepped up sanitary controls close to where the country's first case of avian influenza was found on a commercial farm, while racing to track the virus to stop its spread.

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.