Table 1.

Position of mutations in isolates as determined by DNA sequencing

Mutation positionNucleotide changeAmino acid changeNo. of mutations in this study
531TCG→TTGSer→Leu23
531TCG→TGGSer→Trp4
526CAC→TACHis→Tyr6
526CAC→GACHis→Asp3
526CAC→CTCHis→Leu1
526CAC→TGCHis→Cys1
516GAC→GTCAsp→Val6
516GAC→TTCAsp→Phe1
511CTG→CCGLeu→Pro1