First outbreak of more deadly H7N9 bird flu virus since 2017 reported in U.S.

The strain that has caused most damage to poultry in recent years and the death of one person in the U.S. is the H5N1.

But the H7N9 bird flu virus has proved to have a far higher death rate, opens new tab, killing nearly 40% of the humans infected since it was first detected in 2013, the World Health Organisation said.

The latest outbreak of H7N9 was detected on a farm of 47,654 commercial broiler breeder chickens in Noxubee, Mississippi, the Paris-based World Animal Health Organisation said in a report on Monday, citing U.S. Authorities.

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