How can diseases spread between wild birds and poultry farms?

Diseases can spread between wild birds and poultry farms through several ecological and environmental pathways.

Mechanisms of Transmission

• Environmental Contamination: Wild birds, such as waterfowl, often serve as natural reservoirs for pathogens like bird flu. These birds may carry viruses in their intestines and shed them into the environment through feces, which can then infect domestic poultry.1
• Direct and Indirect Contact: Once a pathogen enters a farm environment, it can be transmitted between birds via saliva, nasal secretions, and feces. Furthermore, the virus can be spread to other farms through airborne, feces-contaminated dust and soil, or via contaminated equipment, clothing, and feed.1
• Ecological Imbalance: Human activities, such as the conversion of natural habitats into farmland, can force wild birds into closer proximity with domestic animals. This ecological disruption increases the likelihood of disease transmission, sometimes involving vectors like mosquitoes that carry pathogens from wild birds to livestock.2
• Reservoir Populations: Feral birds, such as pigeons, can act as reservoirs for various diseases, including psittacosis and fungal infections, posing a potential risk to both poultry and human health.3