Abstract
This study reports the genetic characterization of highly pathogenic avian influenza (HPAI) virus (subtype H5N1) isolated from poultry in West Bengal, India. We analyzed all the eight genome segments of two viruses isolated from chickens in January 2010 to understand their genetic relationship with other Indian H5N1 isolates and possible connection between different outbreaks. The hemagglutinin (HA) gene of the viruses showed multiple basic amino acids at the cleavage site, a marker for high virulence in chickens. Of greatest concern was that the viruses displayed amino acid substitution from serine-to-asparagine at position 31 of M2 ion channel protein suggesting emergence of amantadine-resistant mutants not previously reported in HPAI H5N1 outbreaks in India. Amino acid lysine at position 627 of the PB2 protein highlights the risk the viruses possess to mammals. In the phylogenetic trees, the viruses clustered within the lineage of avian isolates from India (2008–2009) and avian and human isolates from Bangladesh (2007–2009) in all the genes. Both these viruses were most closely related to the viruses from 2008 in West Bengal within the subclade 2.2.3 of H5N1 viruses.


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Acknowledgments
We thank Director, Indian Veterinary Research Institute and Indian Council of Agricultural Research, New Delhi for providing necessary facilities to carry out this work. We also thank two anonymous referees for valuable suggestions on the improvement of the manuscript. We are thankful to the Department of Animal Husbandry, Dairying and Fisheries, Ministry of Agriculture, Government of India for financial support through CDDL for Avian influenza diagnosis and research grant. The authors wish to thank the State Animal Husbandry Department, West Bengal for providing the clinical materials.
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11262_2010_534_MOESM1_ESM.ppt
Supplementary Figure S1. Phylogenetic relationships of the PB2 (a), PB1 (b), PA (c), NP (d), M (e) and NS (f) genes of representative influenza A viruses. The sequence regions compared were as follows: nucleotide positions 28-2304 of PB2, 25-2295 of PB1, 25-2172 of PA, 46-1539 of NP, 26-1006 of M and 27-869 of NS. The trees were rooted to A/goose/Guangdong/1/1996. Numbers near the node indicates bootstrap values of ≥70%. Scale bar indicates nucleotide substitutions per site. The Bangladesh/India sub-cluster is highlighted. *Indicate isolates sequenced in this study. (PPT 343 kb)
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Tosh, C., Murugkar, H.V., Nagarajan, S. et al. Emergence of amantadine-resistant avian influenza H5N1 virus in India. Virus Genes 42, 10–15 (2011). https://doi.org/10.1007/s11262-010-0534-z
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DOI: https://doi.org/10.1007/s11262-010-0534-z


