Brazil's Santa Catarina state said it has ruled out an outbreak of bird flu in a commercial chicken farm while the federal government was keeping it on a list of suspected cases pending further tests.

The results of genetic tests suggested that Brazil's first outbreak of bird flu on a commercial poultry farm in the state of Rio Grande do Sul shares the strain with cases in zoo animals in the same state,

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.