Related Experiment Video
Updated: Jul 5, 2026

Influenza Virus Propagation in Embryonated Chicken Eggs
Published on: March 19, 2015
Transmission of infectious bronchitis virus within vaccinated and unvaccinated groups of chickens
J J de Wit1, M C de Jong, A Pijpers
1Animal Health Service, Deventer.
Abstract:
The aim of this study was to determine whether vaccination against infectious bronchitis virus (IBV) reduces virus transmission, i.e. to test whether IBV transmission among vaccinated chickens is significantly reduced compared to that among unvaccinated chickens. In two vaccinated and two unvaccinated groups of SPF chickens, a standard measure for virus transmission, the reproduction ratio (R) was determined. R is defined as the average number of new infections caused by one typical infectious individual during its entire infectious period. A single vaccination by eye-drop with IBV H120 reduced the transmission of the IBV challenge virus among the vaccinated chickens (estimated R = 0.69, s.e. = 0.33) significantly (P < 0.05) compared to the transmission among the unvaccinated chickens (estimated R = 19.95, s.e. = 12.41). The possible implications for further study, including selection or development of vaccines are discussed.
Related Concept Videos
Chickenpox
Viral Recombination
Transmission-based Precautions II: Airborne and Protective Environment
Airborne precautions:
Use airborne precautions when treating patients known or suspected to have diseases that spread through the air—for example, tuberculosis or measles. These organisms are present in smaller droplets expelled by an infected person and...
Vaccinations
Transmission of Pathogens
Influenza

