We generated a consensus sequence for each segment of the H1N1(2009) virus by aligning all 1715 complete and partial sequences available from the NCBI H1N1 flu resources database (http://www.ncbi.nlm.nih .gov/genomes/FLU/SwineFlu.html) as of 11 June 2009 using MAFFT (12) with high-accuracy option.