Agarose-gel electrophoresis of samples analyzed by nested multiplex PCR. Lanes: M, DNA Marker; S1, CQ2010 (CRF01-AE); S2, FJ9909 (CRF01-AE); S3, SC9712 (D); S4, JS11 (D); S5, SC0227 (C); S6, JS0121 (C); S7, HEN0217 (B′); S8, JS0127 (B′); S9, EC9005 (B); S10, SD20 (A); S11, JS17 (A).