Abstract
Equine influenza (EI) continues to be an important respiratory pathogen of horses worldwide. Since 2007 several outbreaks of EI have occurred in Central Asian countries, including Kazakhstan, western Mongolia, India and western China. Phylogenetic analysis showed that two H3N8 equine influenza virus (EIV) isolates from Kazakhstan, A/equine/Almaty/26/2007 and A/equine/South Kazakhstan/236/12, were related to Florida sublineage 2, with high similarity to EIVs circulating in the same period in neighbouring countries. New outbreaks of EI during 2011 and 2012 in Kazakhstan and other Central Asian countries were caused by viruses of the same lineage. Genetic characterization of the viruses showed formation of a small EIV cluster with specific genetic signatures and continued evolution of this lineage in Central Asia between 2007 and 2012. The main genetic changes were observed in hemagglutinin gene without any antigenic drift. Although no vaccination policy was carried out in Kazakhstan, application of Florida clade 2–based vaccines is recommended.

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Acknowledgments
This work was supported by the Science Committee of the Education and Science Ministry of the Republic of Kazakhstan, Grant Project No. 0106PК00818 “Studying of the ecology of influenza A virus in Kazakhstan” in the framework of the Scientific Technical Program 0.0392 «Avian Influenza: research, development of tools and methods for struggle» and WHO Project No. CSR12-180-9 “Avian Influenza Virus Surveillance in Kazakhstan”. We also thank Alexander Shevtsov and other colleagues from the National Center of Biotechnology (Astana, Kazakhstan) for sequencing the 2007 viruses, and M. Lipkind (Kimron Veterinary Institute, Beit Dagan, Israel) and Dr. Fouchier (Netherlands) for kindly providing the spectrum of anti-neuraminidase and subtype-specific anti-hemagglutinin sera for subtyping of viruses. The authors thank T.C. Harder and E. Starick for editorial advice during the preparation of the manuscript.
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Karamendin, K., Kydyrmanov, A., Kasymbekov, Y. et al. Continuing evolution of equine influenza virus in Central Asia, 2007-2012. Arch Virol 159, 2321–2327 (2014). https://doi.org/10.1007/s00705-014-2078-3
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DOI: https://doi.org/10.1007/s00705-014-2078-3

