Natural transmission of ILTV is through the upper respiratory and ocular routes. Transmission is via direct contact with contaminated people and equipment.ILTV can remain in biofilm of drinking water lines and subsequently be transmitted to susceptible birds.Vermin and wild birds and dogs may aid mechanical transmission.
Infectious Avian Laryngotracheitis virus attacks the respiratory system once the infection takes hold. These include:
- Nasal discharge which is often bloody
- Coughing which may also include blood
- Upper respiratory tract pain
- Abnormal lung sounds
- Decreased egg production