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.

Brazilian authorities on Wednesday have declared the country as "free" of the bird flu virus after no new outbreaks were detected on commercial poultry farms, Reuters reported, citing a statement from the agriculture ministry.

Masaio Ishizuka, a senior epidemiologist at the Sao Paulo University, said evidence suggests migratory birds have now infected local Brazilian species, making the bird flu virus endemic in the world's largest chicken exporter, which accounts for 39% of global trade.