Another suspected mechanism is the use of infected poultry manure as fertilizer in agriculture and aquaculture, and as feed in fish-farms and pig farms, BirdLife says.

• 同时国际鸟盟也表示，另一种受到怀疑的传染机制则是使用受感染的家禽粪肥作为农业和水产养殖的肥料，或作为鱼类、猪只养殖场的饲料。