The HA gene of the HPAI H5N1 virus has a number of clades and many different clade names described in various publications. To facilitate resolution of this nomenclature problem and to make comparisons among virus clades easier across publications, the World Health Organization (WHO), World Animal Health Organization (OIE) and the Food and Agriculture Organization (FAO) H5N1 Evolution Working Group has created a unified system for the HA clade designation of HPAI H5N1 viral strains.
In order to take advantage of the above clade designation, we implemented a Web tool which makes the clade prediction in a manner analogous to an NCBI BLAST search. Along with the Web tool, this website offers functions to Browse Sequence Database, View updates, and learn about Clade Designation Criteria. In addition, the FAQs page provides answers to most of the frequently asked questions. Please Contact us if you have questions or have found a bug on this website.