Volume 10, Number 4, April 2004

Recombination Resulting in Virulence Shift in Avian Influenza Outbreak, Chile

David L. Suarez,* Dennis A. Senne,† Jill Banks,‡ Ian H. Brown,‡ Steve C. Essen,‡ Chang-Won Lee,* Ruth J. Manvell,‡ Christian Mathieu-Benson,§ Valentina Moreno,§ Janice C. Pedersen,† Brundaban Panigrahy,† Hernán Rojas,§ Erica Spackman,* and Dennis J. Alexander‡
*Southeast Poultry Research Laboratory, Athens, Georgia, USA; †National Veterinary Services Laboratories, Ames, Iowa, USA; ‡Veterinary Laboratories Agency–Weybridge, New Haw, Addlestone, Surrey, United Kingdom; §Ministerio de Agricultura, Santiago, Chile

Figure 1. Phylogenetic tree of the hemagglutinin subtype 7 nucleotide sequence, which includes both low pathogenic and highly pathogenic avian influenza viruses from Chile. Representative avian and equine H7 influenza gene sequences are also included. The tree was generated with PAUP 4.0b4 computer program with bootstrap replication (500 bootstraps) and a heuristic search method. The tree is rooted to A/Equine/London/1416/73, and branch lengths are included on the tree. Standard two-letter postal codes are used for states in the United States. TK, turkey; CK, chicken; DK, duck; and FPV, fowl plague virus.

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This page last reviewed March 22, 2004

Emerging Infectious Diseases Journal
National Center for Infectious Diseases
Centers for Disease Control and Prevention