tetano
Editor, Senior Moderator
10.1128/JVI.03437-12
The recent establishment of North American H10 lineage influenza viruses in Australian wild waterfowl and the evolution of Australian avian influenza viruses
Dhanasekaran Vijaykrishnaa*,
Yi-Mo Dengb,
Yvonne C. F. Sua,
Mathieu Fourmenta,
Pina Iannellob,
George G. Arzeyc,
Philip M. Hansbrod,
K. Edla Arzeyc,
Peter D. Kirklandc,
Simone Warnere,
Kim O?Rileye,
Ian G. Barrb,
Gavin J. D. Smitha,f and
Aeron C. Hurtb,g*
+ Author Affiliations
Laboratory of Virus Evolution, Duke-NUS Graduate Medical School, 8 College Road, Singaporea
WHO Collaborating Centre for Reference and Research on Influenza, Parkville, Victoria, 3052 Australia b
Elizabeth Macarthur Agricultural Institute, Menangle, New South Wales, 2568 Australiac
Hunter Medical Research Institute & University of Newcastle, New Lambton, New South Wales, 2305 Australiad
Biosciences Research Division, Department of Primary Industries, Bundoora, Victoria, 3083 Australiae
Duke Global Health Institute, Duke University, Durham NC 27708 United Statesf
Monash University, School of Applied Science and Engineering, Churchill, Victoria, Australiag
ABSTRACT
Influenza A H10N7 virus with a hemagglutinin gene of North American origin was detected in Australian chickens and poultry abattoir workers in New South Wales in 2010 and in chickens in Queensland on a mixed chicken and domestic duck farm in 2012. We investigated their genomic origins by sequencing full and partial genomes of H10 viruses isolated from wild aquatic birds and poultry in Australia and analysed them with all available avian influenza virus sequences from Oceania and representative viruses from North America and Eurasia. Our analysis showed that the H10N7 viruses isolated from poultry were similar to those circulating since 2009 in Australian aquatic birds; and their initial transmission into Australia occurred during 2007?2008. The H10 viruses that appear to have developed endemicity in Australian wild aquatic birds, were derived from several viruses circulating in waterfowl along various flyways. Their hemagglutinin gene was derived from aquatic birds in the western states of the USA, whereas the neuraminidase was closely related to viruses previously detected in waterfowl in Japan. The remaining genes were derived from Eurasian avian influenza lineages. Our analysis of virological data spanning 40 years in Oceania indicates that the long-term evolutionary dynamics of avian influenza viruses in Australia may be determined by climatic changes. The introduction and long-term persistence of avian influenza virus lineages were observed during periods with increased rainfall, whereas bottlenecks and extinction was observed during phases of widespread decreases in rainfall. These results extend our understanding of factors affecting the dynamics of avian influenza and provide important considerations for surveillance and disease control strategies.
http://jvi.asm.org/content/early/2013/07/10/JVI.03437-12.abstract
The recent establishment of North American H10 lineage influenza viruses in Australian wild waterfowl and the evolution of Australian avian influenza viruses
Dhanasekaran Vijaykrishnaa*,
Yi-Mo Dengb,
Yvonne C. F. Sua,
Mathieu Fourmenta,
Pina Iannellob,
George G. Arzeyc,
Philip M. Hansbrod,
K. Edla Arzeyc,
Peter D. Kirklandc,
Simone Warnere,
Kim O?Rileye,
Ian G. Barrb,
Gavin J. D. Smitha,f and
Aeron C. Hurtb,g*
+ Author Affiliations
Laboratory of Virus Evolution, Duke-NUS Graduate Medical School, 8 College Road, Singaporea
WHO Collaborating Centre for Reference and Research on Influenza, Parkville, Victoria, 3052 Australia b
Elizabeth Macarthur Agricultural Institute, Menangle, New South Wales, 2568 Australiac
Hunter Medical Research Institute & University of Newcastle, New Lambton, New South Wales, 2305 Australiad
Biosciences Research Division, Department of Primary Industries, Bundoora, Victoria, 3083 Australiae
Duke Global Health Institute, Duke University, Durham NC 27708 United Statesf
Monash University, School of Applied Science and Engineering, Churchill, Victoria, Australiag
ABSTRACT
Influenza A H10N7 virus with a hemagglutinin gene of North American origin was detected in Australian chickens and poultry abattoir workers in New South Wales in 2010 and in chickens in Queensland on a mixed chicken and domestic duck farm in 2012. We investigated their genomic origins by sequencing full and partial genomes of H10 viruses isolated from wild aquatic birds and poultry in Australia and analysed them with all available avian influenza virus sequences from Oceania and representative viruses from North America and Eurasia. Our analysis showed that the H10N7 viruses isolated from poultry were similar to those circulating since 2009 in Australian aquatic birds; and their initial transmission into Australia occurred during 2007?2008. The H10 viruses that appear to have developed endemicity in Australian wild aquatic birds, were derived from several viruses circulating in waterfowl along various flyways. Their hemagglutinin gene was derived from aquatic birds in the western states of the USA, whereas the neuraminidase was closely related to viruses previously detected in waterfowl in Japan. The remaining genes were derived from Eurasian avian influenza lineages. Our analysis of virological data spanning 40 years in Oceania indicates that the long-term evolutionary dynamics of avian influenza viruses in Australia may be determined by climatic changes. The introduction and long-term persistence of avian influenza virus lineages were observed during periods with increased rainfall, whereas bottlenecks and extinction was observed during phases of widespread decreases in rainfall. These results extend our understanding of factors affecting the dynamics of avian influenza and provide important considerations for surveillance and disease control strategies.
http://jvi.asm.org/content/early/2013/07/10/JVI.03437-12.abstract