Brazil has declared itself free from bird flu after no new cases emerged in commercial farms since the first outbreak in May, paving the way for a return to international markets for the world’s largest chicken supplier.

Brazil's vast and diverse geography, with the Amazon to the north, mountain ranges along the Atlantic coast and the Andes to its west, may have helped it avoid the U.S. fate of widespread bird flu among commercial poultry flocks by keeping migratory birds away from farms in the country's interior.

FileBrazil on Wednesday declared its commercial flocks free of the bird flu virus after observing a 28-day period without any new commercial farm outbreaks, the country's ministry of agriculture said.