PARIS--China reported an outbreak of highly pathogenic H5N6 bird flu at a duck farm in Guangxi province, the Paris-based World Organization for Animal Health (OIE) said on Wednesday, citing a report from the Chinese agriculture ministry.

The virus killed 23,950 ducks out of a flock of 30,462 ducks, the ministry said. The remaining birds were all slaughtered, it said.

In a separate report, China also reported an outbreak of highly pathogenic H7N9 bird flu in a backyard in Shaanxi province, the OIE said.

The virus killed 810 layers out of a flock of 1,000 birds, it says.