Brazil's state of Tocantins has ruled out the occurrence of highly pathogenic avian influenza, known as bird flu, in a local commercial farm citing preliminary test results, according to a statement sent to Reuters on Wednesday.

Brazil recently ruled out three suspected bird flu cases but continues to investigate others, particularly in commercial farms. The nation, a leading chicken exporter, faces trade implications from potential outbreaks,

Brazil, the world's largest chicken exporter, on Friday reported its first case of highly pathogenic avian influenza - also known as bird flu - on a commercial farm, triggering fears over global poultry supply chains, reported Reuters .