Key result
Experimental challenge with a novel variant avian orthoreovirus (LY383) caused arthritis/tenosynovitis syndrome in broilers despite high levels of maternal antibodies from commercial vaccines.
Why the study?
Avian orthoreovirus infections cause arthritis/tenosynovitis syndrome and economic losses, and viral arthritis/tenosynovitis syndrome has occurred frequently in China in recent years.
A novel variant avian orthoreovirus field strain in China can evade current commercial vaccines and cause arthritis/tenosynovitis in broilers.
Indicates potential vaccine escape by emerging reovirus variants; leaves open need for updated vaccines pending field validation.
Avian orthoreovirus (ARV) infections of broiler flocks cause arthritis/tenosynovitis syndrome and significant economic losses. ARV variants were detected in the USA and Canada. Viral arthritis/tenosynovitis syndrome has occurred frequently in China in recent years. In this study, a variant ARV strain associated with viral arthritis/tenosynovitis syndrome was isolated from broilers and designated as LY383. Genomic sequence and phylogenetic analysis of the σC nucleic acid and amino acid sequences revealed that the isolate was closely related to ARV field strains Reo/PA/Layer/01224B/14, Reo/PA/Broiler/1551/13, GA/14602/2014, GA/13569/2013 and GA/13542/2013, in cluster V, but distinct from most Chinese field strains or commercial vaccine strains. Experimental challenge showed that the isolate could cause arthritis/tenosynovitis syndrome in broilers, which possessed a high level of maternal antibodies induced by commercial ARV vaccines (S1133, 1733 and T98). Furthermore, viral nucleic acid could be detected in cloacal swabs of all challenged birds throughout the entire test from 5 dpi onward. These results suggest that a novel ARV genotype emerges and might become prevalent in broiler flocks in China.RESEARCH HIGHLIGHTS A variant avian orthoreovirus was isolated from a vaccinated broiler flock in North China.The ARV field strain was distinct from previous China-origin ARV isolates and vaccine strains.The current commercial ARV vaccine could not provide effective protection of broilers against the field isolate infection.These findings indicated that variant ARV field strains might become frequent in broiler flocks in China and effective measures should be conducted to prevent and control the disease.
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Chen et al. (2019) studied Avian orthoreovirus (ARV) infection. Experimental challenge with variant ARV strain LY383 was evaluated on Arthritis/tenosynovitis syndrome and viral nucleic acid detection. Experimental challenge with a novel variant avian orthoreovirus (LY383) caused arthritis/tenosynovitis syndrome in broilers despite high levels of maternal antibodies from commercial vaccines.
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