Animal health groups had warned about the risk of spread to the the region's wildlife.
Since January 1, outbreaks have already led to the loss of 1.66 million poultry.
In November, Cameroon said it would receive 331,200 doses of the RTS,S vaccine, which is produced by GSK.
In the fall, France became the first country in Europe to launch poultry vaccination.
Since the outbreaks began, health officials have monitored more than 7,000 people exposed to infected birds or mammals.
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.