By Debora Ely and Ana Mano MONTENEGRO, Brazil (Reuters) -Brazilian authorities hope to determine by Tuesday whether a confirmed outbreak of highly pathogenic avian influenza among wild birds in a zoo in the southern state of Rio Grande do Sul is connected with the country's first bird flu case on a commercial poultry farm 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.

Poultry supply remains stable despite Brazil reporting its first bird flu outbreak at a commercial farm last week, supermarkets in Singapore said on Tuesday (May 20). On Friday (May 16), Brazil, the world's largest chicken exporter,