As the virus evolves and spread patterns change, existing control tools might not be enough.
The H5N6 case, as well as 2 new H9N2 cases, were in Sichuan province.
In Antarctica, 48 bird species and 26 marine mammal species inhabit the region, some of which live in dense colonies.
A sharp rise in Western equine encephalomyelitis in animals was recently reported in Argentina and Uruguay, posing a threat to people in the region.
In just December, the outbreaks have led to the loss of more than 7.2 million poultry.
In the US, outbreaks in multiple states affect chicken, turkey, and duck farms, including a farm housing 2.6 million egg-laying chickens in Ohio.
In 2022, the EU backed a plan to introduce vaccination in poultry, starting with France, which began the practice this fall.
The latest outbreaks range from Arkansas broiler farms to a California duck producer.
In November alone, outbreaks have led to the loss of about 7.6 million more poultry.
Of six cases reported from Cambodia this year, four were fatal.