Host-specific genetic variation of highly pathogenic avian influenza viruses (H5N1)

Virus Genes. 2011 Jun;42(3):363-8. doi: 10.1007/s11262-011-0583-y. Epub 2011 Feb 17.


The complete genome sequences of two isolates A/chicken/Egypt/CL6/07 (CL6/07) and A/duck/Egypt/D2br10/07 (D2br10/07) of highly pathogenic avian influenza virus (HPAI) H5N1 isolated at the beginning of 2007 outbreak in Egypt were determined and compared with all Egyptian HPAI H5N1 sequences available in the GenBank. Sequence analysis utilizing the RNA from the original tissue homogenate showed amino acid substitutions in seven of the viral segments in both samples. Interestingly, these changes were different between the CL6/07 and D2br10/07 when compared to other Egyptian isolates. Moreover, phylogenetic analysis showed independent sub-clustering of the two viruses within the Egyptian sequences signifying a possible differential adaptation in the two hosts. Further, pre-amplification analysis of H5N1 might be necessary for accurate data interpretation and identification of distinct factor(s) influencing the evolution of the virus in different poultry species.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Chickens
  • Disease Outbreaks
  • Ducks
  • Egypt / epidemiology
  • Genetic Variation*
  • Host Specificity*
  • Influenza A Virus, H5N1 Subtype / classification
  • Influenza A Virus, H5N1 Subtype / genetics*
  • Influenza A Virus, H5N1 Subtype / isolation & purification*
  • Influenza A Virus, H5N1 Subtype / pathogenicity
  • Influenza in Birds / epidemiology
  • Influenza in Birds / virology*
  • Molecular Sequence Data
  • Phylogeny
  • Poultry Diseases / epidemiology
  • Poultry Diseases / virology*
  • Viral Proteins / genetics


  • Viral Proteins

Associated data

  • GENBANK/AB465592
  • GENBANK/AB465593
  • GENBANK/AB465594
  • GENBANK/AB465595
  • GENBANK/AB465620
  • GENBANK/AB465621
  • GENBANK/AB465622
  • GENBANK/AB465623
  • GENBANK/AB465624
  • GENBANK/AB465625
  • GENBANK/AB465626
  • GENBANK/AB465627
  • GENBANK/AB465628
  • GENBANK/AB465629
  • GENBANK/AB468063
  • GENBANK/AB468064