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.
The outbreak in Georgia is its first at a commercial farm since H5N1 began spreading in US poultry.
Cambodia has now reported six H5N1 cases this year.