Unique amino acid changes observed in 17 CHIVs detected in China compared to 22 earlier published strains^*.

*Twenty-two CHIKV whole-genome sequences were selected for comparison with the imported CHIKVs, including three east/central/south African strains: S27 (GenBank: AF369024), NC004162 (GenBank: NC_004162), and ROSS (GenBank: AF490259); thirteen Indian Ocean strains: IND-00-MH4 (GenBank: EF027139), IND-06-TN1(GenBank: EF027138), CHIK31 (GenBank: EU564335), TM25 (GenBank: EU564334), DRDE-06 (GenBank: EF210157), ITA07-RA1 (GenBank: EU244823), Wuerzburg (GenBank: EU037962), D570/06 (GenBank: EF012359), IND-06-RJ1 (GenBank: EF027137), IND-06-MH2 (GenBank: EF027136), IND-06-KA15 (GenBank: EF027135), IND-06-AP3 (GenBank: EF027134), and LR2006 OPY1 (GenBank: DQ443544); five Asian strains: IND-60-WB1 (GenBank: EF027140), IND-73-MH5 (GenBank: EF027141), AF15561 (GenBank: EF452493), TSI-GSD-218 (GenBank: L37661), and MY002IMR/06/BP (GenBank: EU703759); and one West African strain: 37997 (GenBank: AY726732) [3].