The need to reduce the number of days of vaccination in broiler flocks has led to the proposal of studies for defining the possible joint administration of a vaccine for preventing avian pneumovirus vaccine and other types of respiratory vaccines. Up to now, these vaccines have been administered separately in order to minimize interaction between them. In principle, the fact that they all compete for the same receptors would imply that there would be interaction between them and, in the end, the protection afforded against pneumovirus could be affected.
After vaccination, the birds were observed daily for 10 consecutive days to determine the presence of clinical signs attributable to the joint administration of the vaccines.
