Infectious Diseases 2020

Infectious Diseases 2020

The pathogenicity of the TW I-type IBV in layers

Zhang et al. Vet Res (2020) 51:95 3 August, 2020

Long-term effects of TW I-type IBV on the quantity and quality of eggs when infection occurs at a very young age in chickens was studied by Chinese researchers.
The researchers evaluated the pathogenicity of the TW I-type IBV strain in SPF chickens infected at one-day-old, for a period of 200 days. The aim of the study was to comprehensively reveal the pathogenicity of TW I-type IBV, particularly regarding the long-term impact on egg production.
The TW I-type infectious bronchitis virus is the second most common genotype of IBV in China.
During the monitoring period, serious lesions occurred in the female reproductive system, such as yolk peritonitis, a shortened oviduct, and cysts of different sizes with effusion in the degenerated right oviduct. The infective viruses persisted in vivo for a long time, and due to the stress of laying, virus shedding was detected again after the onset of egg production.