Identification of a divergent genotype of equine arteritis virus from South American donkeys.

The research article discusses the identification of a new type of equine arteritis virus (EAV), which is found in wild donkeys in Chile. The virus is notably different from the EAV strains that affect horses, having diverged from it at least a century ago.

Introduction and Methodology

• The researchers identified a distinct type of equine arteritis virus (EAV) happening in feral donkeys in Chile.
• The new viral strain was isolated and sequenced, enabling a comparison with other known EAV strains.
• A phylogenetic analysis was conducted to understand the evolutionary relationship between the newly discovered virus and other EAV strains.

Phylogenetic Analysis

• The phylogenetic analysis indicates the divergence between the newly identified viral strain and known equine EAV strains.
• According to their study, the new virus and the asinine (related to donkey) strains from South Africa took a separate evolutionary path from the horse EAV strains about 100 years ago.

Results and Conclusion

• The results of the study are significant as they show the existence of a distinctly different EAV genotype. This genotype occurs in donkey populations as opposed to the typically studied horse populations.
• Understanding this divergence and the unique genotype is crucial in studying the transmission, pathogenesis, and control methods for EAV in donkey populations.
• It suggests the necessity for further research into the EAV viruses affecting donkeys, which might contribute significantly to our understanding of EAV evolution and disease control.