How Is Avian Influenza Spread
AI is primarily spread by direct contact between healthy birds and infected birds, and through indirect contact with contaminated equipment and materials. The virus is excreted through the feces of infected birds and through secretions from the nose, mouth and eyes. Contact with infected fecal material is the most common of bird-to-bird transmission. Wild ducks often introduce LPAI into domestic flocks raised on range or in open flight pens through fecal contamination. Within a poultry house, transfer of an HPAI virus between birds also can occur via airborne secretions. The spread of avian influenza between poultry premises almost always follows the movement of contaminated people and equipment. AI also can be found on the outer surfaces of egg shells and in the case of HPAI, can infect the inside of the egg which includes the yolk and albumen or the egg white. Transfer to eggs is a potential means of AI transmission. Airborne transmission of virus from farm to farm is highly unlikely
