These strains include, Tor2 (AY274119) [64], [65], Utah (AY714217) [66], FRA (AY310120) [59], HKU-39849 (AY278491) [57], [67], BJ01 (AY278488) [68], [69], NS1 (AY508724) [70], ZJ01 (AY297028) [70], GD01 (AY278489) [69] and GZ50 (AY304495) [71].