14株致儿童猩红热A族β溶血性链球菌多位点序列分型

目的 对A族β溶血性链球菌(beta-haemolytic group A streptococcus isolates,GAS)进行多位点序列分型(multilocus sequence typing,MLST).方法 应用多聚酶链反应(polymerase chain reaction,PCR)对来源于2007年北京和上海两地区分属于不同emm分型及其亚型、且对大环内酯类抗生素高水平耐药的14株致儿童猩红热GAS的 7对等位看家基因进行扩增,并将目的 基因产物测序,然后将所测得的每对等位看家基因的基因序列提交到MLST网站,获得相应的由7对等位看家基因组成的等位基因谱,最后将等位基因谱再次提交到MLST网站,确定GAS临床分离株MLST序列分型(sequence type,ST).结果 St5240、emm1.0型及其亚型GAS等位基因图谱为4-3-4-4-4-2-4,属于ST28型;emm4.0型GAS等位基因谱为5-7-8-5-15-2-1,属于ST38型;emm12.0型及其亚型GAS等位基因谱为5-2-2-6-6-2-2,属于ST36型;emm22.0型GAS等位基因谱为9-8-1-1-1-3-4,属于ST46型.结论 致2007年北京和上海两地区儿童发生猩红热的14株GAS分属于ST28、ST38、ST36及ST46四个不同的克隆系.

Multilocus sequence typing of 14 group A streptococcus isolates from children with scarlet fever

Objective To analyze beta-hemolytic group A streptococcus (GAS) isolates using multilocus sequence typing (MLST).Methods In 2007,14 GAS isolates of scarlet fever were collected from children in Shanghai and Beijing.All isolates had high-level macrolide resistance and belonged to different emm types and sub-types.Seven house-keeping genes of these isolates were amplified by PCR and sequenced.These sequences were sent to the MLST website for their isoallele sequences to identify their sequence types.Results S...