Dear Altor,
about dust if you have an air forced ventilation system it means that air, dust and virus go out from the house and if quite close (less than 1 km) you have another poultry farm this is a rysk. About inscets I don’t have data about their specific role, but in general I know that they could reparesent a way for the transmission of the virus.
Going to biosecurity measures to avoid the spread of AI virus (but in general of any pathogen) from the house through the ventilation system in Italy we are discussing about some measures to be adopetd. I consider that the presence of closed rooms where air goes out form the house could be effective to limit the spread and reduce this rysk.
